Conversion of units refers to conversion factors between different units of measurement for the same quantity. Quantity is a kind of property which exists as magnitude or multitude

## Techniques

### Dimensioned values

Carrying units through a mathematical operation is sometimes performed.

e. g. to convert 6 feet into metres. From below one foot is exactly 0. 3048 metre. Thus:

6 ft × 0. 3048 m/ft = 1. 8288 m

This leaves only metres, the desired result.

This works because the numerator and denominator describe the same quantity, the factor is equivalent to the number 1. Therefore, multiplication by this factor does not change the measured quantity, only its units.

### Rounding of results

The process of making a conversion cannot produce a more precise result than the original quoted figure. Appropriate rounding of results is normally performed after conversion. (See significant figures). The significant figures (also called significant digits and abbreviated sig figs) of a number are those digits that carry meaning contributing to its accuracy

In the above example the 0. 3048 metre per foot is precise by definition, but the precision of the answer is determined by the precision of the 6 ft figure and in many cases the result would need rounding perhaps to 1. 8 m.

## Tables of conversion factors

### Legend

≡ definition exactly equal to approximately equal to indicates the digits repeat infinitely

### Luminance

Luminance
Name of unitSymbolDefinitionRelation to SI units
candela per square metre (SI base unit)≡ cd/m2= 1 cd/m2
lambertL≡ (104/π) cd/m2≈ 3183. Luminance is a photometric measure of the density of Luminous intensity in a given direction "Nit (unit" redirects here For the unit of information entropy see Nat (information. The International System of Units (SI defines seven dimensionally independent SI base units. 09886 cd/m2

### Length

Length
Name of unitSymbolDefinitionRelation to SI units
metre (SI base unit)m≡ 1 m= 1 m
ångströmÅ= 0. Length is the long Dimension of any object The length of a thing is the distance between its ends its linear extent as measured from end to end The metre or meter is a unit of Length. It is the basic unit of Length in the Metric system and in the International The International System of Units (SI defines seven dimensionally independent SI base units. An ångström or angstrom (symbol Å) (ˈɔːŋstrəm Swedish: ˈɔ̀ŋstrœm is an internationally recognized non- SI unit of length equal 1 nm≡ 1×10−10 m
astronomical unitAUMean distance from Earth to the Sun= 149 597 870 691 ± 30 m
atomic unit of lengtha0≡ Bohr radius of hydrogen≈ 5. The astronomical unit ( AU or au or au or sometimes ua) is a unit of Length based on the distance from the Earth to the Atomic units ( au) form a System of units convenient for Atomic physics, Electromagnetism, and Quantum electrodynamics, especially 29 177 208 59×10−11 ± 3. 6×10−20 m[1]
barley corn ≡ ⅓ in= 0. 0846 m
Bohr radiusa0; bα/4πR≈ 5. In the Bohr model of the structure of an Atom, put forward by Niels Bohr in 1913 Electrons orbit a central nucleus. The fine-structure constant or Sommerfeld fine-structure constant, usually denoted \alpha \ is the Fundamental physical constant characterizing The Rydberg Constant, named after the Swedish Physicist Johannes Rydberg, is a Physical constant relating to atomic spectra in the 291 772 083×10−11 ± 19×10−20 m
cable length (Imperial) ≡ 608 ft= 185. 3184 m
cable length (International) ≡ 1/10 nmi= 185. A cable length or cable's length is a Nautical unit of measure equal to one tenth of a Nautical mile or 100 Fathoms, or sometimes 2 m
cable length (U. S. ) ≡ 720 ft= 219. 456 m
calibrecal≡ 1 in= 0. The term caliber or calibre designates the interior Diameter of a tube or the exterior diameter of a wire or rod 0254 m
chain (Gunter's; Surveyor's)ch≡ 66. A chain is a unit of Length; it measures 66 feet or 22 yards (20 Edmund Gunter ( 1581 - December 10, 1626) English Mathematician, of Welsh descent was born in Hertfordshire in 1581 0 ft (4 rods)= 20. 1168 m
chain (Ramsden's; Engineer's)ch≡ 100 ft= 30. A chain is a unit of Length; it measures 66 feet or 22 yards (20 Jesse Ramsden ( October 6, 1735 – November 5, 1800) was an English astronomical and scientific instrument maker 48 m
cubit ≡ 18 in= 0. 4572 m
ellell≡ 45 in= 1. 143 m
fathomfm≡ 6 ft= 1. 8288 m
fathomfm≈ 1/1000 nmi= 1. 852 m
fermifm≡ 1×10−15 m= 1×10−15 m
finger ≡ 7/8 in= 0. 00022225 m
finger (cloth) ≡ 4 ½ in= 0. 1143 m
foot (Benoît)ft (Ben)≈ 0. A foot (plural feet or foot; symbol or abbreviation ft or sometimes &prime – the prime symbol) is a non-SI unit 304 799 735 m
foot (Clarke's; Cape)ft (Cla)≈ 0. A foot (plural feet or foot; symbol or abbreviation ft or sometimes &prime – the prime symbol) is a non-SI unit 304 797 265 4 m
foot (Indian)ft Ind≈ 0. A foot (plural feet or foot; symbol or abbreviation ft or sometimes &prime – the prime symbol) is a non-SI unit 304 799 514 m
foot (International)ft≡ 12 inches = 1/3 yd= 0. A foot (plural feet or foot; symbol or abbreviation ft or sometimes &prime – the prime symbol) is a non-SI unit 3048 m
foot (Sear's)ft (Sear)≈ 0. A foot (plural feet or foot; symbol or abbreviation ft or sometimes &prime – the prime symbol) is a non-SI unit 304 799 47 m
foot (U. A foot (plural feet or foot; symbol or abbreviation ft or sometimes &prime – the prime symbol) is a non-SI unit S. Survey)ft (US)≡ 1200/3937 m [2]≈ 0. 304 800 610 m
french; charriereF≡ 1/3 mm= 3. The French catheter scale (most correctly abbreviated as Fr but also often abbreviated as FR or F is commonly used to measure the outer diameter of cylindrical medical instruments 3 ×10−4 m
furlongfur≡ 10 chains = 660 ft =220 yd= 201. A furlong is a measure of Distance in Imperial units and US customary units. 168 m
geographical mile≡ 6082 ft= 1853. The geographical mile is a unit of length determined by 1 minute of arc along the Earth 's Equator, approximately equal to 1855 7936 m
hand ≡ 4 in= 0. 1016 m
inchin≡ 1/36 yd = 1/12 ft= 0. Inches redirects here To see the Les Savy Fav album see Inches. 0254 m
leaguelea≡ 3 mi= 4828. A league is a unit of Length or Area long common in Europe and Latin America, although no longer an official unit in any nation 032 m
light-day ≡ 24 light-hours= 2. A light day (also written light-day) is a Unit of length. It is defined as the Distance Light travels in an absolute Vacuum in one 590 206 837 12×1013 m
light-hour ≡ 60 light-minutes= 1. A light-hour (also written light hour) is a unit of Length. It is the distance travelled by Light in Vacuum in one Hour 079 252 848 8×1012 m
light-minute ≡ 60 light-seconds= 1. A light-minute (also written light minute) is a Unit of length. 798 754 748×1010 m
light-second ≡ 2. A light-second is a Unit of length. It is defined as the Distance Light travels in an absolute Vacuum in one Second or 299792458 997 924 58×108 m
light-yearl. A light-year or light year (symbol ly) is a unit of Length, equal to just under ten trillion Kilometres As defined by y. c0 × 86 400 × 365. 25= 9. 460 730 472 580 8×1015 m
lineln≡ 1/12 in (Klein 1988, 63)≈ 0,00 002 116 667 m
link (Gunter's; Surveyor's)lnk≡ 1/100 ch= 0. 201 168 m
link (Ramsden's; Engineer's)lnk≡ 1 ft= 0. 3048 m
mickey ≡ 1/200 in= 1. 27×10−4 m
micronµ≡ 1×10−6 m
mil; thoumil≡ 1×10−3 in= 2. A micrometre ( American spelling: micrometer; symbol µm) is one millionth of a Metre, or equivalently one thousandth of a Millimetre MilA thou, also known as a mil, is a unit of Length equal to 0 54×10−5 m
mil (Sweden and Norway)mil≡ 10 km= 10000 m
milemi≡ 1760 yd = 5280 ft= 1609. A mil ( Norwegian and Swedish for Mile) is a unit of Length, usually used to measure geographic distance fairly common in Norway A mile is a unit of Length, usually used to measure Distance, in a number of different systems including Imperial units United States 344 m
mile (U. A mile is a unit of Length, usually used to measure Distance, in a number of different systems including Imperial units United States S. Survey)mi≡ 5280 ft (US)= 5280 × 1200/3937 m ≈ 1609. 347 219 m
nail (cloth) ≡ 2 ¼ in= 0. 000 571 5 m
nautical leagueNL; nl≡ 3 nmi= 5556 m
nautical mile(international)NM; nmi≡ 1852 m [3]1852 m
nautical mile (Admiralty)NM (Adm); nmi (Adm)≡ 6080 ft≡ 1853. A nautical mile or sea mile is a unit of Length. It corresponds approximately to one minute of Latitude along any meridian. A nautical mile or sea mile is a unit of Length. It corresponds approximately to one minute of Latitude along any meridian. 184 m
pace ≡ 2. 5 ft= 0. 762 m
palm ≡ 3 in= 0. 000 762 m
parsecpc= 3. History The first direct measurements of an object at interstellar distances were undertaken by German Astronomer Friedrich Wilhelm Bessel in 1838 08567782 ×1016 ± 6×106 m [4]
point (ATA)pt≡ 0. 013837 in= 0. 000 351 459 8 m
point (Didot; European)pt≡ 0. 000 376 065 m
point (metric)pt≡ 3/8 mm= 0. 000 375 m
point (PostScript)pt≡ 1/72 in≈ 0. PostScript ( PS) is a dynamically typed concatenative Programming language created by John Warnock and Charles Geschke in 1982 000 352 778 m
quarter ≡ ¼ yd= 0. 2286 m
rod; pole; perchrd≡ 16 ½ ft= 5. The rod is a unit of Length equal to 55 Yards 11 Cubits 50292 Meters 16 0292 m
roperope≡ 20 ft= 6. 096 m
span ≡ 6 in= 0. 1524 m
span (cloth) ≡ 9 in= 0. 2286 m
spat[3]≡ 1012 m= 1×1012 m
stick ≡ 2 in= 0. 05 08 m
stigma; pm ≡ 1×10−12 m≡ 1×10−12 m
telegraph milemi≡ 6087 ft= 1855. A mile is a unit of Length, usually used to measure Distance, in a number of different systems including Imperial units United States 3176 m
twiptwp≡ 1/1440 in≈ 1. A twip (derived from TW entieth of an I mperial P oint) is a typographical measurement defined as 1/20 of a typographical point 763 889×10−5 m
x unit; siegbahnxu≈ 1. The X-unit (symbol xu) is a unit of length formerly used to measure the Wavelength of X-rays and Gamma rays. 0021×10−13 m
yard (International)yd≡3 ft ≡ 36 in= 0. A yard (abbreviation yd) is a unit of Length in several different systems including English units Imperial units and United 9144 m[2]

### Area

Area
Name of unitSymbolDefinitionRelation to SI units
acreac≡ 10 sq ch = 4840 sq yd= 4046. Surface area is the measure of how much exposed Area an object has The acre is a unit of Area in a number of different systems including the imperial and U 856 422 4 m²
area≡ 100 m²
barnb≡ 10−28
barony ≡ 4000 ac= 1. Conversions One are is equivalent to Metric 00001 km2 (square kilometres 0 A barn (symbol b) is a unit of Area. While the barn is not an SI unit it is accepted (although discouraged for use with the SI 618 742 568 96×107
boardbd≡ 1 in × 1 ft= 7. 741 92×10−3
boiler horsepower equivalent direct radiationbhp EDR≡ (1 ft²) (1 bhp) / (240 BTUIT/h)≈ 12. 958 174 m²
circular inchcirc in≡ π/4 sq in≈ 5. Inches redirects here To see the Les Savy Fav album see Inches. 067 075×10−4
circular mil; circular thoucirc mil≡ π/4 mil²≈ 5. 067 075×10−10
cord ≡ 192 bd= 1. 486 448 64 m²
dunam ≡ 1000 m²= 1000 m²
hectareha≡ 10 000 m²= 10 000 m²
hide ≡ 100 ac= 4. A dunam or dönüm, dunum, donum is a unit of Area used in the Ottoman Empire and still used in various standardized versions Explanation The hectare is commonly used in most countries around the world especially in domains concerned with land planning and management such as Agriculture, The hide was a unit used in assessing land for liability to " Geld " or land tax in Anglo-Saxon England from the 7th to the 11th centuries 046 856 422 4×105
roodro≡ ¼ ac= 1011. 714 105 6 m²
shed≡ 10−52
square chainsq ch≡ 1 sq ch= 404. A shed is a non- SI unit of Area or Cross-section used in Nuclear physics. 685 642 24 m²
square footsq ft≡ 1 ft × 1 ft= 9. The square foot is an Imperial unit / US customary unit (non- SI non- metric) of Area, used mainly in the United States 290 304×10−2
square inchsq in≡ 1 in × 1 in= 6. A square inch (plural square inches) is a unit of Area, equal to the area of a square with sides of one Inch. 4516×10−4
square kilometrekm²≡ 1 km²= 106
square linksq lnk≡ 1 lnk²= 4. Square Kilometre ( US spelling square kilometer) symbol km2, is a decimal multiple of the SI unit of 046 856 422 4×10−2
square metre (SI unit)≡ 1 m × 1 m= 1 m²
square mil; square thousq mil≡ 1 mil × 1 mil= 6. M^2 redirects here For other uses see M². CM2 redirects here The metre or meter is a unit of Length. It is the basic unit of Length in the Metric system and in the International 4516×10−10
square mile; sectionsq mi≡ 1 mi × 1 mi= 2. A mile is a unit of Length, usually used to measure Distance, in a number of different systems including Imperial units United States 589 988 110 336×106
square rod/pole/perchsq rd≡ 1 sq rd= 25. 292 852 64 m²
square U. S. Survey footsq ft≡ 1 sq ft (US)≈ 9. The foot is an Anatomical structure found in many Animals It is the terminal portion of a limb which bears weight and allows Locomotion. 290 341 161 327 49×10-2
square U. S. Survey milesq mi≡ 1 sq mi (US)≈ 2. A mile is a unit of Length, usually used to measure Distance, in a number of different systems including Imperial units United States 589 998×106
square yardsq yd≡ 1 yd × 1 yd= 0. The square yard is an imperial / US customary (non- metric) unit of Area, formerly used in most of the English -speaking world but now 836 127 36 m²
stremma ≡ 1000 m²= 1000 m²
township ≡ 36 sq mi (US)≈ 9. The stremma ( Greek:στρέμμα plural στρέμματα is a Greek unit of land area equal to 1000 Square metres also called the 'royal' stremma Survey township, sometimes called Congressional township, as used by the United States Public Land Survey System, refers to a square unit of 323 994×107
yardland ≡ 30 ac= 1. 214 056 926 72×105

### Volume

Volume
Name of unitSymbolDefinitionRelation to SI units
acre footac ft≡ 1 ac x 1 ft = 43560 ft³= 1233. The volume of any solid plasma vacuum or theoretical object is how much three- Dimensional space it occupies often quantified numerically An acre-foot is a unit of Volume commonly used in the United States in reference to large-scale water resources such as reservoirs, Aqueducts 481 837 547 52 m³
cubic metre (SI unit)≡ 1 m × 1 m × 1 m= 1 m³
litreL≡ 1 dm³ [5]= 0. CM3 redirects here If you were looking for the 3rd game in the Cooking Mama series abbreviated as CM3 see here. The litre or liter (see spelling differences) is a unit of Volume. 001 m³
lambdaλ≡ 1 mm³= 1 ×10−9
drop (metric) ≡ 1/20 mL= 5 ×10−9
minim (Imperial)min≡ 1/480 fl oz (Imp) = 1/60 fl dr (Imp)≈ 5. Lambda (uppercase Λ, lowercase λ; Λάμβδα or el Λάμδα Lamda is the 11th letter of the Greek alphabet. The drop is a Unit of measure of Volume, the amount dispensed as one drop from a dropper. The minim (abbreviated min or ♏) is a unit of Volume in both the imperial and US customary systems of measurement 9 193 880 208 333 ×10−9
minim (U. S. )min≡ 1/480 US fl oz = 1/60 US fl dr= 6. 1 611 519 921 875 ×10−9
drop (U. S. ) (alt)gtt≡ 1/456 US fl oz≈ 6. 4 854 231 ×10−9
drop (Imperial) (alt)gtt≡ 1/1824 gi (Imp)≈ 7. 7 886 684 ×10−9
drop (U. S. )gtt≡ 1/360 US fl oz= 8. 2 148 693 229 16 ×10−9
drop (medical) ≡ 1/12 mL= 83 ×10−9
drop (Imperial)gtt≡ 1/288 fl oz (Imp)= 9. 8 656 467 0138 ×10−9
dash (U. S. ) ≡ 1/96 US fl oz = ½ US pinch= 0. 0308 057 599 609 375 ×10−6
dash (Imperial) ≡ 1/384 gi (Imp) = ½ pinch (Imp)= 0. 0369 961 751 302 083 ×10−6
pinch (U. S. ) ≡ 1/48 US fl oz = ⅛ US tsp= 0. 0616 115 199 218 75 ×10−6
pinch (Imperial) ≡ 1/192 gi (Imp) = ⅛ tsp (Imp)= 0. 0739 923 502 604 16 ×10−6
fluid scruple (Imperial)fl s≡ 1/24 fl oz (Imp)= 0. 1183 877 604 16 ×10−6
fluid drachm (Imperial)fl dr≡ ⅛ fl oz (Imp)= 0. The dram (archaic spelling drachm; Apothecary symbol ℨ) was historically both a Coin and a Weight. 3551 632 812 5 ×10−6
fluid dram (U. The dram (archaic spelling drachm; Apothecary symbol ℨ) was historically both a Coin and a Weight. S. ); U. S. fluidramfl dr≡ ⅛ US fl oz= 0. 3696 691 195 312 5 ×10−6
teaspoon (Canadian)tsp≡ 1/6 fl oz (Imp)≈ 0. A teaspoon is a small Spoon, or a spoon used in measuring commonly used to stir the contents of a cup of Tea or Coffee. 4735 510 416 667 ×10−6
teaspoon (U. S. )tsp≡ 1/6 US fl oz= 0. 4928 921 595 ×10−6
teaspoon (metric) ≡ 0. 5 ×10−6
teaspoon (Imperial)tsp≡ 1/24 gi (Imp)= 0. 5919 388 020 83 ×10−6
dessertspoon (Imperial) ≡ 1/12 gi (Imp)= 1. A dessert spoon is a spoon designed specifically for eating dessert 1838 776 0416 ×10−6
tablespoon (Canadian)tbsp≡ ½ fl oz (Imp)= 1. A tablespoon is a type of Spoon used for serving Measure of volume It is also a measure of Volume used in cooking 4206 531 25 ×10−6
tablespoon (U. S. )tbsp≡ ½ US fl oz= 1. 4786 764 782 5 ×10−6
tablespoon (metric) ≡ 1. 5 ×10−6
cubic inchcu in≡ 1 in × 1 in × 1 in= 1. Inches redirects here To see the Les Savy Fav album see Inches. 6387 064 ×10−5
tablespoon (Imperial)tbsp≡ 5/8 fl oz (Imp)= 1. 7758 164 0625 ×10−6
pony ≡ 3/4 US fl oz= 2. 218 014 717 187 5 ×10−6
fluid ounce (Imperial)fl oz (Imp)≡ 1/160 gal (Imp)= 2. A fluid ounce (abbreviated fl oz, fl oz or oz fl) is a unit of Volume in both the imperial and the US customary systems 8413 062 5 ×10−6
fluid ounce (U. S. )US fl oz≡ 1/128 gal (US)= 2. 9573 529 5625 ×10−6
shot ≡ 1 US fl oz= 2. 9573 529 5625 ×10−6
jigger ≡ 1½ US fl oz= 4. 4360 294 343 75 ×10−6
gill (U. A gill is an anatomical structure found in many aquatic organisms S. )gi (US)≡ 4 US fl oz= 11. 8294 118 25 ×10−6
gill (Imperial); Noggingi (Imp); nog≡ 5 fl oz (Imp)= 14. 2065 312 5 ×10−6
cup (Canadian)c (CA)≡ 8 fl oz (Imp)= 22. The cup is a unit of measurement for volume used in cooking to measure bulk foods such as Granulated sugar (dry measurement and liquids ( Fluid measurement 73045 ×10−6
cup (U. S. )c (US)≡ 8 US fl oz ≡ 1/16 gal (US)= 23. 6588 2365 ×10−6
cup (metric)c≡ 25. 0 ×10−6
breakfast cup ≡ 10 fl oz (Imp)= 28. 4130 625 ×10−6
pint (U. The pint is an English unit of Volume or capacity in the imperial system and United States customary units. S. fluid)pt (US fl)≡ ⅛ gal (US)= 47. 3176 473 ×10−6
pint (U. S. dry)pt (US dry)≡ 1/64 bu (US lvl) ≡ ⅛ gal (US dry)= 0. 000 550 610 471 3575 m³
pint (Imperial)pt (Imp)≡ ⅛ gal (Imp)= 0. 000 568 261 25 m³
fifth ≡ 1/5 US gal= 0. 000 757 082 356 8 m³
quart (U. The quart is an imperial and US customary unit of Volume equal to a quarter of a Gallon. S. fluid)qt (US)≡ ¼ gal (US fl)= 0. 000 946 352 946 m³
quart (U. S. dry)qt (US)≡ 1/32 bu (US lvl) = ¼ gal (US dry)= 0. 001 101 220 942 715 m³
quart (Imperial)qt (Imp)≡ ¼ gal (Imp)= 0. 001 136 522 5 m³
pottle; quartern ≡ ½ gal (Imp) = 80 fl oz (Imp)= 0. 002 273 045 m³
board-footfbm≡ 144 cu in= 0. The board-foot is a specialized unit of Volume for measuring Lumber in the United States and Canada. 002 359 737 216 m³
gallon (U. A gallon is a measure of Volume. It is in current use in the United States and still has limited use in many other English-speaking countries S. fluid; Wine)gal (US)≡ 231 cu in= 0. 003 785 411 784 m³
gallon (U. S. dry)gal (US)≡ ⅛ bu (US lvl)= 0. 004 404 883 770 86 m³
gallon (Imperial)gal (Imp)= 0. 004 546 09 m³
beer gallonbeer gal≡ 282 cu in= 0. 004 621 152 048 m³
peck (U. A peck is an imperial and US customary unit of dry volume, equivalent in each of these systems to 8 dry Quarts or 16 dry Pints Two S. dry)pk≡ ¼ US lvl bu= 0. 008 809 767 541 72 m³
peck (Imperial)pk≡ 2 gal (Imp)= 0. A peck is an imperial and US customary unit of dry volume, equivalent in each of these systems to 8 dry Quarts or 16 dry Pints Two 009 092 18 m³
bucket (Imperial)bkt≡ 4 gal (Imp)= 0. A bucket (bkt was an Imperial unit of liquid Volume, equivalent to four Gallons or 18 018 184 36 m³
timber foot ≡ 1 cu ft= 0. 028 316 846 592 m³
cubic footcu ft≡ 1 ft × 1 ft × 1 ft= 0. The cubic foot is an imperial and US customary (non- metric) unit of Volume, used in the United States Canada and the United Kingdom 028 316 846 592 m³
firkin ≡ 9 gal (US)= 0. A Firkin is an old English unit of volume The name is derived from the Middle Dutch word vierdekijn which means 034 068 706 056 m³
bushel (U. A bushel is a unit of dry volume, usually subdivided into eight local Gallons in the systems of Imperial units and U S. dry level)bu (US lvl)≡ 2150. 42 cu in= 0. 035 239 070 166 88 m³
bushel (Imperial)bu (Imp)≡ 8 gal (Imp)= 0. 036 368 72 m³
bushel (U. S. dry heaped)bu (US)≡ 1 ¼ bu (US lvl)= 0. 044 048 837 708 6 m³
strike (U. S. ) ≡ 2 bu (US lvl)= 0. 070 478 140 333 76 m³
strike (Imperial) ≡ 2 bu (Imp)= 0. 072 737 44 m³
kilderkin ≡ 18 gal (Imp)= 0. The kilderkin is an old English unit of volume equal to half a barrel or two firkins 081 829 62 m³
sack (U. S. ) ≡ 3 bu (US lvl)= 0. 105 717 210 500 64 m³
sack (Imperial); bag ≡ 3 bu (Imp)= 0. 109 106 16 m³
barrel (U. S. dry)bl (US)≡ 105 qt (US) = 105/32 bu (US lvl)= 0. 115 628 198 985 075 m³
barrel (U. S. fluid)fl bl (US)≡ 31½ gal (US)= 0. 119 240 471 196 m³
coomb ≡ 4 bu (Imp)= 0. 145 474 88 m³
barrel (petroleum)bl; bbl≡ 42 gal (US)= 0. 158 987 294 928 m³
barrel (Imperial)bl (Imp)≡ 36 gal (Imp)= 0. 163 659 24 m³
hogshead (U. A hogshead is a large cask of liquid (less often of a food commodity) S. )hhd (US)≡ 2 fl bl (US)= 0. 238 480 942 392 m³
seam ≡ 8 bu (US lvl)= 0. 281 912 561 335 04 m³
quarter; pail ≡ 8 bu (Imp)= 0. A bucket, also called a pail, is a watertight vertical Cylinder or truncated cone, with an open top and a flat bottom usually attached 290 949 76 m³
hogshead (Imperial)hhd (Imp)≡ 2 bl (Imp)= 0. 327 318 48 m³
cord-foot ≡ 16 cu ft= 0. 453 069 545 472 m³
butt, pipe ≡ 126 gal (wine)= 0. The butt (from the Medieval French and Italian botte) or pipe is an old English unit of Wine casks holding two Hogsheads 476 961 884 784 m³
perchper≡ 16½ ft × 1½ ft × 1 ft= 0. Perca is the genus of fish referred to as perch or sometimes yellow perch, a group of freshwater Fish belonging to the family Percidae 700 841 953 152 m³
cubic yardcu yd≡ 27 cu ft= 0. A yard (abbreviation yd) is a unit of Length in several different systems including English units Imperial units and United 764 554 857 984 m³
tun ≡ 252 gal (wine)= 0. Units of mass There are three similar units of Mass called the ton: Long ton (simply ton in countries such as the United 953 923 769 568 m³
displacement ton ≡ 35 cu ft= 0. Units of mass There are three similar units of Mass called the ton: Long ton (simply ton in countries such as the United 991 089 630 72 m³
water ton ≡ 28 bu (Imp)= 1. 018 324 16 m³
freight ton ≡ 40 cu ft= 1. 132 673 863 68 m³
wey (U. A wey is a unit of Mass used in England since before 900 CE The value of a wey has varied over time though was originally used to denote 2 Hundredweight S. ) ≡ 40 bu (US lvl)= 1. 409 562 806 675 2 m³
load ≡ 50 cu ft= 1. 415 842 329 6 m³
register ton ≡ 100 cu ft= 2. 831 684 659 2 m³
last ≡ 80 bu (Imp)= 2. A last is the Form used in Shoemaking to shape a Shoe in the rough form of a human Foot. 909 497 6 m³
cord (firewood) ≡ 8 ft × 4 ft × 4 ft= 3. 624 556 363 776 m³
cubic fathomcu fm≡ 1 fm × 1 fm × 1 fm= 6. A fathom is a unit of Length in the Imperial system (and the derived U 116 438 863 872 m³
acre-inch ≡ 1 ac × 1 in= 102. 790 153 128 96 m³
cubic milecu mi≡ 1 mi × 1 mi × 1 mi= 4,168,181,825. A mile is a unit of Length, usually used to measure Distance, in a number of different systems including Imperial units United States 440 579 584 m³

### Angle

Angle
Name of unitSymbolDefinitionRelation to SI units
centesimal second of arc"≡ 1 grad/10000≈ 1. In Geometry and Trigonometry, an angle (in full plane angle) is the figure formed by two rays sharing a common Endpoint, called The radian is a unit of plane Angle, equal to 180/ π degrees, or about 57 A minute of arc, arcminute, or MOA is a unit of angular measurement, equal to one sixtieth (1/60 of one degree. 57 079 6×10−6 rad
arcsecond"≡ 1°/3600≈ 4. A minute of arc, arcminute, or MOA is a unit of angular measurement, equal to one sixtieth (1/60 of one degree. 84 813 7×10−6 rad
centesimal minute of arc'≡ 1 grad/100≈ 15. A minute of arc, arcminute, or MOA is a unit of angular measurement, equal to one sixtieth (1/60 of one degree. 708 0×10−6 rad
minute of arc'≡ 1°/60≈ 29. A minute of arc, arcminute, or MOA is a unit of angular measurement, equal to one sixtieth (1/60 of one degree. 088 8×10−6 rad
angular milµ≡ 2π/6400 rad≈ 9. An angular mil, also mil, is a unit of Angle. Origin of the name All versions of the angular mil are approximately the same size as a 8174 8×10−4 rad
grad; gradian; gongrad≡ 2π/400 rad = 0. The grad is a unit of plane Angle, equivalent to of a full Circle, dividing a Right angle in 100 The grad is a unit of plane Angle, equivalent to of a full Circle, dividing a Right angle in 100≈ 1. 570 796 3×10−3 rad
sign ≡ 30°≈ 0. 523 599 rad
octant ≡ 45°≈ 0. An octant is one of eight divisions Octant in the plane An octant is one of 8 parts of the two-dimensional Euclidean coordinate system 785 398 rad
sextant ≡ 60°≈ 1. 047 198 rad

### Solid angle

Solid angle
Name of unitSymbolDefinitionRelation to SI units

### Mass

Note: see Weight for detail of mass/weight distinction and conversion

Mass
Name of unitSymbolDefinitionRelation to SI units
kilogram, grave(SI base unit)kg; G= 1kg
electron rest massme≈ 9. The solid angle, Ω, is the angle in three-dimensional space that an object Subtends at a point The steradian (symbol sr) is the SI unit of Solid angle. It is used to describe two-dimensional angular spans in three- Dimensional space SI derived units are part of the SI system of measurement units and are derived from the seven SI base units They are derived from SI basic units/defined In the Physical sciences weight is a Measurement of the gravitational Force acting on an object Mass is a fundamental concept in Physics, roughly corresponding to the Intuitive idea of how much Matter there is in an object A grave is a metallic reference standard of one thousand Grams that was used for a few years until it was replaced by the Kilogram standard in 1799 The International System of Units (SI defines seven dimensionally independent SI base units. The electron is a fundamental Subatomic particle that was identified and assigned the negative charge in 1897 by J 109 381 88×10−31 ± 72×10−39 kg
atomic unit of massamu≡ me≈ 9. Atomic units ( au) form a System of units convenient for Atomic physics, Electromagnetism, and Quantum electrodynamics, especially 109 381 88×10−31 ± 72×10−39 kg
unified atomic mass unitu≈ 1. The unified atomic mass unit ( u) or Dalton ( Da) or sometimes universal mass unit, is an unit of Mass used to express 660 538 73×10−27 ± 13×10−35 kg
daltonDa≈ 1. The unified atomic mass unit ( u) or Dalton ( Da) or sometimes universal mass unit, is an unit of Mass used to express 660 902 10×10−27 ± 13×10−35 kg
gammaγ≡ 1 ×10-6 kg
point ≡ 1/100 kt (metric)= 2 ×10-6 kg
mite ≡ 1/20 gr= 3. 239 945 5 ×10-6 kg
mite (metric) ≡ 1/20 g= 50 ×10-6 kg
graingr≡ 64. In many cultures a grain is a unit of measurement of Mass that is based upon the mass of a single seed of a typical Cereal. 798 91 ×10-6 kg
crith ≈ 89. Chris Eubank (born Christopher Livingstone Eubanks on August 8 1966) is a retired boxer and English celebrity who held the WBO Middleweight 9349 ×10-6 kg
carat (metric)ct≡ 200 ×10-6 kg
caratkt≡ 3 1/6 gr≈ 205. The carat is a unit of Mass used for measuring gems and Pearls Currently a carat is defined as exactly 200  mg (0 The carat is a unit of Mass used for measuring gems and Pearls Currently a carat is defined as exactly 200  mg (0 196 548 333 ×10-6 kg
sheet ≡ 1/700 lb av= 647. 9891 ×10-6 kg
scruple (apothecary)s ap≡ 20 gr= 1. 295 978 2 ×10-3 kg
pennyweightdwt; pwt≡ 1/20 oz t= 1. A pennyweight (dwt is a unit of Mass which is the same as 24 grains, 1/240th of a Troy pound, 1/20th of a Troy ounce, approximately 0 555 173 84 ×10-3 kg
dram (avoirdupois)dr av≡ 27 11/32 gr= 1. The avoirdupois (ˌævərdəˈpɔɪz French avwaʀdypwɑ system is a system of weights (or properly Mass) based on a pound of sixteen Ounces 771 845 195 312 5 ×10-3 kg
dram (apothecary; troy)dr t≡ 60 gr= 3. The dram (archaic spelling drachm; Apothecary symbol ℨ) was historically both a Coin and a Weight. Troy weight is a system of units of Mass customarily used for Precious metals Black powder, and Gemstones Named after Troyes 887 934 6 ×10-3 kg
hyl (CGS unit) ≡ 1 gee × 1 g × 1 s²/m= 9. In the gravitational metric system(s the base unit of force is not normalised to one mass unit ( Gram or Kilogram) times one length unit ( Metre or centimetre 806 65 ×10-3 kg
assay ton (short)AT≡ 1 mg × 1 sh tn ÷ 1 oz t≈ 29. 166 667 ×10-3 kg
ounce (apothecary; troy)oz t≡ 1/12 lb t= 31. Troy weight is a system of units of Mass customarily used for Precious metals Black powder, and Gemstones Named after Troyes 103 476 8 ×10-3 kg
assay ton (long)AT≡ 1 mg × 1 long tn ÷ 1 oz t≈ 32. 666 667 ×10-3 kg
mark ≡ 8 oz t= 248. 827 814 4 ×10-3 kg
pound (troy)lb t≡ 5760 grains= 0. The pound or pound-mass (abbreviation lb, lbm, or sometimes in the United States #) is a unit of Mass 373 241 721 6 kg
pound (avoirdupois)lb av≡ 7000 grains= 0. The pound or pound-mass (abbreviation lb, lbm, or sometimes in the United States #) is a unit of Mass 453 592 37 kg
pound (metric) ≡ 0. The pound or pound-mass (abbreviation lb, lbm, or sometimes in the United States #) is a unit of Mass 5 kg
clove ≡ 8 lb av= 3. 628 738 96 kg
stonest≡ 14 lb av= 6. The stone is a unit of Weight. It is part of the Imperial system of weights and measures used in the British Isles, and formerly used in most 350 293 18 kg
hyl (MKS unit) ≡ 1 gee × 1 kg × 1 s²/m= 9. In the gravitational metric system(s the base unit of force is not normalised to one mass unit ( Gram or Kilogram) times one length unit ( Metre or centimetre 806 65 kg
quarter (Imperial) ≡ 1/4 long cwt = 2 st = 28 lb av= 12. 700 586 36 kg
slug; geepoundslug≡ 1 gee × 1 lb av × 1 s²/ft≈ 14. 593 903 kg
bag (Portland cement) ≡ 94 lb av= 42. Portland cement is the most common type of Cement in general usage in many parts of the world as it is a basic ingredient of Concrete, mortar, Stucco 637 682 78 kg
short hundredweight; centalsh cwt≡ 100 lb av= 45. Hundred weight or hundredweight is a Unit of measurement for Mass in U 359 237 kg
long hundredweightlong cwt or cwt≡ 112 lb av= 50. Hundred weight or hundredweight is a Unit of measurement for Mass in U 802 345 44 kg
bag (coffee)≡ 60 kg= 60 kg
quintal (metric)q≡ 100 kg
wey ≡ 252 lb = 18 st (variants exist)= 114. CoFFEE is an Open source Software for computer supported collaborative learning (CSCL in a digital classroom The quintal or centner is a historical unit of Mass with many different definitions in different countries but usually it is 100 base units of mass e A wey is a unit of Mass used in England since before 900 CE The value of a wey has varied over time though was originally used to denote 2 Hundredweight 305 277 24 kg
long quarter (informal) ≡ ¼ long tn= 254. 011 727 2 kg
quarter (informal) ≡ ¼ short tn= 226. 796 185 kg
kipkip≡ 1000 lb av= 453. In the United States a kip is a unit of Force that equals 1000 pounds-force, used primarily by architects and engineers of mayapur to measure engineering loads 592 37 kg
short tonsh tn≡ 2000 lb= 907. The short ton ( S/T) is a unit of mass equal to 2000 lb (around 907 184 74 kg
tonne (mts unit)t≡ 1000 kg
long tonlong tn or ton≡ 2240 lb= 1016. This article is about the tonne or metric ton For other tons see Ton. The metre-tonne-second or mts system of units is a system of Physical units It was invented in France hence the unit names sthène and pièze 046 908 8 kg
barge ≡ 22 ½ sh tn= 20,411. 656 65 kg
ZentnerZtr. Definitions vary; see [6] and [7]. See also discussion at Talk:Conversion of units#Zentner

In physics, the pound of mass is sometimes written lbm to distinguish it from the pound-force (lbf). Physics (Greek Physis - φύσις in everyday terms is the Science of Matter and its motion. The pound or pound-mass (abbreviation lb, lbm, or sometimes in the United States #) is a unit of Mass This article deals with the unit of force For the unit of mass see Pound (mass. It should not be read as the mongrel unit "pound metre".

### Time

Time, t
Name of unitSymbolDefinitionRelation to SI units
second (SI base unit)s= 1 s
Planck time ≡ (G/c5)½≈ 1. For other uses see Time (disambiguation Time is a component of a measuring system used to sequence events to compare the durations of The second ( SI symbol s) sometimes abbreviated sec, is the name of a unit of Time, and is the International System of Units The International System of Units (SI defines seven dimensionally independent SI base units. In Physics, the Planck time ( tP) is the unit of Time in the system of Natural units known as Planck units. The gravitational constant, denoted G, is a Physical constant involved in the calculation of the gravitational attraction between objects with mass The Planck constant (denoted h\ is a Physical constant used to describe the sizes of quanta. 351 211 818×10−43 s
atomic unit of timeaua0/(α·c)≈ 2. Atomic units ( au) form a System of units convenient for Atomic physics, Electromagnetism, and Quantum electrodynamics, especially In the Bohr model of the structure of an Atom, put forward by Niels Bohr in 1913 Electrons orbit a central nucleus. The fine-structure constant or Sommerfeld fine-structure constant, usually denoted \alpha \ is the Fundamental physical constant characterizing 418 884 254×10−17 s
svedbergS≡ 10−13 s= 100×10-13 s
shake ≡ 10−8 s= 10×10-8 s
sigma ≡ 10−6 s= 10×10-6 s
jiffy ≡ 1/60 s≈ . A svedberg (symbol S, sometimes Sv, not to be confused with Sv for the SI unit Sievert as well as the non-SI Sverdrup) is a non- 016667 s
jiffy (alternate) ≡ 1/100 s= 10 ms
helek ≡ 1/1080 h≈ 3. The helek ( Hebrew, meaning "portion" plural halakim) is a unit of Time used in the calculation of the Hebrew calendar. 333333 s
minutemin≡ 60 s
millidaymd≡ 86 400 s / 1000≡ 86. A minute is a Unit of measurement of Time or of Angle. The minute is a unit of Time equal to 1/60th of an Hour or 60 Metric time is the measure of time interval using the Metric system, which defines the Second as the base unit of time and multiple and submultiple units formed with 4 s
moment ≡ 90 s≡ 90 s
ke(traditional) ≡ 1/100 d≡ 864 s
quarter (of an hour)ke≡ 1/96 d≡ 900 s
hourh≡ 60 min= 3600 s
dayd≡ 24 h= 86 400 s
weekwk≡ 7 d= 604 800 s
fortnight ≡ 2 wk= 1 209 600 s
month (hollow)mo≡ 29 d= 2 505 600 s
monthmo≡ 30 d= 2 592 000 s
month (full)mo≡ 31 d= 2 678 400 s
year (Calendar)a, y, or yr≡ 365 d= 31 536 000 s
year (Gregorian)a, y, or yr≡ 365. The ke (刻 Pinyin: kè) is a traditional Chinese unit of Decimal time lasting approximately a quarter of a western Hour. The ke (刻 Pinyin: kè) is a traditional Chinese unit of Decimal time lasting approximately a quarter of a western Hour. The hour (symbol h) is a unit of Time. It is not an SI unit but is accepted for use with the SI A day (symbol d is a unit of Time equivalent to 24 Hours and the duration of a single Rotation of planet Earth with respect to the A week (also called sennight or sevennight) is a unit of Time longer than a Day and shorter than a Month. Note Please link only to revelant articles per "WPOVERLINK" The month is a unit of Time, used with Calendars which is approximately as long as some natural period related to the motion of the Moon; The month is a unit of Time, used with Calendars which is approximately as long as some natural period related to the motion of the Moon; The month is a unit of Time, used with Calendars which is approximately as long as some natural period related to the motion of the Moon; A year (from Old English gēr) is the time between two recurrences of an event related to the Orbit of the Earth around the Sun A year (from Old English gēr) is the time between two recurrences of an event related to the Orbit of the Earth around the Sun 2425 d= 31 556 952 s
year (Julian)a, y, or yr≡ 365. A year (from Old English gēr) is the time between two recurrences of an event related to the Orbit of the Earth around the Sun 25 d= 31 557 600 s
sidereal yeara, y, or yr≡ 365. The sidereal year is the time taken for the Sun to return to the same position with respect to the Stars of the Celestial sphere. 256363 d= 31 558 149. 76 s
Olympiad ≡ 4 a of 365 d= 1. An Olympiad is a period of four years associated with the Olympic Games of Classical Greece. 2614×108 s
lustre; lustrum ≡ 5 a of 365 d= 1. 5768×108 s
octaeteris ≡ 8 a of 365 d= 2. In Astronomy, an octaeteris (plural octaeterides) is the period of eight Solar years after which the Moon phase occurs on the same day of 522 88×108 s
decade ≡ 10 a of 365 d= 3. A decade is a period of 10 Years (since 1594 a factor of 10 difference between two numbers, or sometimes a set or a group of ten (since 1451 1536×108 s
enneadecaeteris; Metonic cycle ≡ 110 mo (hollow) + 125 mo (full) = 19 a of 365 d= 5. Metonic cycle or Enneadecaeteris in Astronomy and Calendar studies is a particular approximate common multiple of the Tropical year Metonic cycle or Enneadecaeteris in Astronomy and Calendar studies is a particular approximate common multiple of the Tropical year 996 16×108 s
Callippic cycle ≡ 441 mo (hollow) + 499 mo (full) = 76 a of 365. In Astronomy and Calendar studies the Callippic cycle (or Calippic is a particular approximate common multiple of the Year (specifically the 25 d= 2. 398 377 6×109 s
century (Calendar) ≡ 100 a of 365 d= 3. A century (from the Latin centum, meaning one hundred is One hundred consecutive Years Centuries are numbered ordinally (e 1536×109 s
century (Julian) ≡ 100 a of 365. A century (from the Latin centum, meaning one hundred is One hundred consecutive Years Centuries are numbered ordinally (e 25 d= 3. 155 76×109 s
Hipparchic cycle ≡ 4 Callippic cycles - 1 d= 9. The Greek astronomer Hipparchus introduced two cycles that have been named after him in later literature 593 424×109 s
millennium (Calendar) ≡ 1000 a of 365 d= 3. A millennium (pl millennia) is a period of Time equal to one thousand Years (from Latin la mille, thousand and la annum 1536×1010 s
millennium (Gregorian) ≡ 1000 a of 365. A millennium (pl millennia) is a period of Time equal to one thousand Years (from Latin la mille, thousand and la annum 2425 d= 3. 155 695 2×1010 s
millennium (Julian) ≡ 1000 a of 365. A millennium (pl millennia) is a period of Time equal to one thousand Years (from Latin la mille, thousand and la annum 25 d= 3. 155 76×1010 s
Sothic cycle ≡ 1461 a of 365 d= 4. The Sothic cycle or Canicular period is a period of 1461 Ancient Egyptian years (of 365 days each or 1460 Julian years (averaging 365 607 409 6×1010 s

### Speed or velocity

Speed
Name of unitSymbolDefinitionRelation to SI units
metre per second (SI unit)m/s≡ 1 m/s
foot per hourfph≡ 1 ft/h≈ 8. Speed is the rate of motion, or equivalently the rate of change in position often expressed as Distance d traveled per unit of A foot (plural feet or foot; symbol or abbreviation ft or sometimes &prime – the prime symbol) is a non-SI unit The hour (symbol h) is a unit of Time. It is not an SI unit but is accepted for use with the SI 466 667×10−5 m/s
furlong per fortnight ≡ furlong/fortnight≈ 1. A furlong is a measure of Distance in Imperial units and US customary units. Note Please link only to revelant articles per "WPOVERLINK" 663 095×10−4 m/s
inch per minuteipm≡ 1 in/min≈ 4. Inches redirects here To see the Les Savy Fav album see Inches. A minute is a Unit of measurement of Time or of Angle. The minute is a unit of Time equal to 1/60th of an Hour or 60 23 333×10−4 m/s
foot per minutefpm≡ 1 ft/min= 5. A foot (plural feet or foot; symbol or abbreviation ft or sometimes &prime – the prime symbol) is a non-SI unit A minute is a Unit of measurement of Time or of Angle. The minute is a unit of Time equal to 1/60th of an Hour or 60 08×10−3 m/s
inch per secondips≡ 1 in/s= 2. Inches redirects here To see the Les Savy Fav album see Inches. The second ( SI symbol s) sometimes abbreviated sec, is the name of a unit of Time, and is the International System of Units 54×10−2 m/s
kilometre per hourkm/h≡ 1 km/h≈ 2. (For the South African airport with IATA code "KMH" see Johan Pienaar Airport. 777 778×10−2 m/s
foot per secondfps≡ 1 ft/s= 3. A foot (plural feet or foot; symbol or abbreviation ft or sometimes &prime – the prime symbol) is a non-SI unit The second ( SI symbol s) sometimes abbreviated sec, is the name of a unit of Time, and is the International System of Units 048×10−1 m/s
mile per hourmph≡ 1 mi/h= 0. 447 04 m/s
knotkn≡ 1 NM/h = 1. A nautical mile or sea mile is a unit of Length. It corresponds approximately to one minute of Latitude along any meridian. 852 km/h≈ 0. 514 444 m/s
knot (Admiralty)kn≡ 1 NM (Adm)/h = 1. 853 184 km/h≈ 0. 514 773 m/s
mile per minutempm≡ 1 mi/min= 26. A mile is a unit of Length, usually used to measure Distance, in a number of different systems including Imperial units United States A minute is a Unit of measurement of Time or of Angle. The minute is a unit of Time equal to 1/60th of an Hour or 60 8224 m/s
mile per secondmps≡ 1 mi/s = 1. A mile is a unit of Length, usually used to measure Distance, in a number of different systems including Imperial units United States The second ( SI symbol s) sometimes abbreviated sec, is the name of a unit of Time, and is the International System of Units 609 344 km/s= 1609. 344 m/s
speed of light in vacuumc≡ 2. 997 924 58×108 m/s= 2. 997 924 58×108 m/s
speed of sound in airs≡ 770 mph = 1230 km/h≈ 344 m/s
machM≡ 331 m/s≈ 331 m/s

A velocity consists of a speed combined with a direction; the speed part of the velocity takes units of speed. Sound is a vibration that travels through an elastic medium as a Wave. In Physics, velocity is defined as the rate of change of Position.

### Acceleration

Acceleration
Name of unitSymbolDefinitionRelation to SI units
metre per second squared (SI unit)m/s²≡ 1 m/s²= 1 m/s²
foot per hour per secondfph/s≡ 1 ft/(h·s)≈ 8. A foot (plural feet or foot; symbol or abbreviation ft or sometimes &prime – the prime symbol) is a non-SI unit The hour (symbol h) is a unit of Time. It is not an SI unit but is accepted for use with the SI The second ( SI symbol s) sometimes abbreviated sec, is the name of a unit of Time, and is the International System of Units 466 667×10−5 m/s²
inch per minute per secondipm/s≡ 1 in/(min·s)≈ 4. Inches redirects here To see the Les Savy Fav album see Inches. A minute is a Unit of measurement of Time or of Angle. The minute is a unit of Time equal to 1/60th of an Hour or 60 The second ( SI symbol s) sometimes abbreviated sec, is the name of a unit of Time, and is the International System of Units 233 333×10−4 m/s²
foot per minute per secondfpm/s≡ 1 ft/(min·s)= 5. A foot (plural feet or foot; symbol or abbreviation ft or sometimes &prime – the prime symbol) is a non-SI unit A minute is a Unit of measurement of Time or of Angle. The minute is a unit of Time equal to 1/60th of an Hour or 60 The second ( SI symbol s) sometimes abbreviated sec, is the name of a unit of Time, and is the International System of Units 08×10−3 m/s²
galileoGal≡ 1 cm/s²= 10−2 m/s²
inch per second squaredips²≡ 1 in/s²= 2. Inches redirects here To see the Les Savy Fav album see Inches. The second ( SI symbol s) sometimes abbreviated sec, is the name of a unit of Time, and is the International System of Units 54×10−2 m/s²
foot per second squaredfps²≡ 1 ft/s²= 3. A foot (plural feet or foot; symbol or abbreviation ft or sometimes &prime – the prime symbol) is a non-SI unit The second ( SI symbol s) sometimes abbreviated sec, is the name of a unit of Time, and is the International System of Units 048×10−1 m/s²
mile per hour per secondmph/s≡ 1 mi/(h·s)= 4. A mile is a unit of Length, usually used to measure Distance, in a number of different systems including Imperial units United States The hour (symbol h) is a unit of Time. It is not an SI unit but is accepted for use with the SI The second ( SI symbol s) sometimes abbreviated sec, is the name of a unit of Time, and is the International System of Units 4704×10−1 m/s²
knot per secondkn/s≡ 1 kn/s≈ 5. The second ( SI symbol s) sometimes abbreviated sec, is the name of a unit of Time, and is the International System of Units 144 444×10−1 m/s²
standard gravityg≡ 9. Gravitation is a natural Phenomenon by which objects with Mass attract one another 806 65 m/s²
mile per minute per secondmpm/s≡ 1 mi/(min·s)= 26. A mile is a unit of Length, usually used to measure Distance, in a number of different systems including Imperial units United States A minute is a Unit of measurement of Time or of Angle. The minute is a unit of Time equal to 1/60th of an Hour or 60 The second ( SI symbol s) sometimes abbreviated sec, is the name of a unit of Time, and is the International System of Units 8224 m/s²
mile per second squaredmps²≡ 1 mi/s²= 1. A mile is a unit of Length, usually used to measure Distance, in a number of different systems including Imperial units United States The second ( SI symbol s) sometimes abbreviated sec, is the name of a unit of Time, and is the International System of Units 609 344×103 m/s²

### Force

Force
Name of unitSymbolDefinitionRelation to SI units
newton (SI unit)N≡ kg·m/s²= 1 N
atomic unit of forceau≡ me·α²·c²/a0≈ 8. In Physics, a force is whatever can cause an object with Mass to Accelerate. The newton (symbol N) is the SI derived unit of Force, named after Isaac Newton in recognition of his work on Classical Atomic units ( au) form a System of units convenient for Atomic physics, Electromagnetism, and Quantum electrodynamics, especially The fine-structure constant or Sommerfeld fine-structure constant, usually denoted \alpha \ is the Fundamental physical constant characterizing In the Bohr model of the structure of an Atom, put forward by Niels Bohr in 1913 Electrons orbit a central nucleus. 238 722 241×10−8 N
dyne (cgs unit)dyn≡ g·cm/s²= 10−5 N
milligrave-force, gravet-forcemGf; gfg × 1 g= 9. The centimetre-gram-second system ( CGS) is a system of physical units. A grave is a metallic reference standard of one thousand Grams that was used for a few years until it was replaced by the Kilogram standard in 1799 Standard gravity, usually denoted by g 0 or g n is the nominal acceleration due to gravity at the Earth's surface at sea level 806 65 mN
poundalpdl≡ 1 lb·ft/s²= 0. The poundal is a non- SI unit of Force. It is a part of the Foot-pound-second system of units a coherent subsystem of English units introduced 138 254 954 376 N
ounce-forceozfg × 1 oz= 0. 278 013 850 953 781 2 N
pound-forcelbfg × 1 lb= 4. This article deals with the unit of force For the unit of mass see Pound (mass. This article deals with the unit of force For the unit of mass see Pound (mass. 448 221 615 260 5 N
kilogram-force; kilopond; grave-forcekgf; kp; Gfg × 1 kg= 9. The unit kilogram-force ( kgf, often incorrectly just kg) or kilopond ( kp) is defined as the Force exerted by Earth's gravity A grave is a metallic reference standard of one thousand Grams that was used for a few years until it was replaced by the Kilogram standard in 1799 806 65 N
sthene (mts unit)sn≡ 1 t·m/s²= 1 ×10−3 N
kip; kip-forcekip; kipf; klbfg × 1000 lb= 4. The metre-tonne-second or mts system of units is a system of Physical units It was invented in France hence the unit names sthène and pièze In the United States a kip is a unit of Force that equals 1000 pounds-force, used primarily by architects and engineers of mayapur to measure engineering loads 448 221 615 260 5 ×103 N
ton-forcetnfg × 1 sh tn= 8. Units of mass There are three similar units of Mass called the ton: Long ton (simply ton in countries such as the United 896 443 230 521 ×103 N

### Pressure or mechanical stress

Pressure
Name of unitSymbolDefinitionRelation to SI units
atmosphere (standard)atm≡ 101 325 Pa [8]
atmosphere (technical)at≡ 1 kgf/cm²= 98. In the Physical sciences weight is a Measurement of the gravitational Force acting on an object Pressure (symbol 'p' is the force per unit Area applied to an object in a direction perpendicular to the surface 0665 ×10−3 Pa [8]
barbar≡ 105 Pa
barye (cgs unit) ≡ 1 dyn/cm²= 0. The bar (symbol bar) decibar (symbol dbar) and the millibar (symbol mbar, also mb are units of Pressure. The centimetre-gram-second system ( CGS) is a system of physical units. 1 Pa
centimetre of mercurycmHg≡ 13 595. 1 kg/m³ × 1 cm × g≈ 1. 333 22 ×10−3 Pa [8]
centimetre of water (4 °C)cmH2O≈ 999. Water is a common Chemical substance that is essential for the survival of all known forms of Life. 972 kg/m³ × 1 cm × g≈ 98. 0638 Pa [8]
foot of mercury (conventional)ftHg≡ 13 595. A foot (plural feet or foot; symbol or abbreviation ft or sometimes &prime – the prime symbol) is a non-SI unit 1 kg/m³ × 1 ft × g≈ 40. 636 66 ×10−3 Pa [8]
foot of water (39. A foot (plural feet or foot; symbol or abbreviation ft or sometimes &prime – the prime symbol) is a non-SI unit Water is a common Chemical substance that is essential for the survival of all known forms of Life. 2 °F)ftH2O≈ 999. 972 kg/m³ × 1 ft × g≈ 2. 988 98 ×10−3 Pa [8]
inch of mercury (conventional)inHg≡ 13 595. Inches redirects here To see the Les Savy Fav album see Inches. 1 kg/m³ × 1 in × g≈ 3. 386 389 ×10−3 Pa [8]
inch of water (39. Inches redirects here To see the Les Savy Fav album see Inches. Water is a common Chemical substance that is essential for the survival of all known forms of Life. 2 °F)inH2O≈ 999. 972 kg/m³ × 1 in × g≈ 249. 082 Pa [8]
kilogram-force per square millimetrekgf/mm²≡ 1 kgf/mm²= 9. 806 65 ×10−6 Pa [8]
kip per square inchksi≡ 1 kipf/sq in≈ 6. In the United States a kip is a unit of Force that equals 1000 pounds-force, used primarily by architects and engineers of mayapur to measure engineering loads Inches redirects here To see the Les Savy Fav album see Inches. 894757 ×10−6 Pa [8]
millimetre of mercurymmHg≡ 13 595. The torr (symbol Torr) is a non- SI unit of Pressure defined as 1/760 of an atmosphere. The torr (symbol Torr) is a non- SI unit of Pressure defined as 1/760 of an atmosphere. 1 kg/m³ × 1 mm × g ≈ 1 torr≈ 133. 322 4 Pa [8]
millimetre of water (3. Water is a common Chemical substance that is essential for the survival of all known forms of Life. 98 °C)mmH2O≈ 999. 972 kg/m³ × 1 mm × g = 0. 999972 kgf/m²= 9. 806 38 Pa
pascal (SI unit)Pa≡ N/m² = kg/(m·s²)= 1 Pa [9]
pièze (mts unit)pz≡ 1000 kg/m·s²= 1 ×10−3 Pa
pound per square footpsf≡ 1 lbf/ft²≈ 47. The metre-tonne-second or mts system of units is a system of Physical units It was invented in France hence the unit names sthène and pièze The pound or pound-mass (abbreviation lb, lbm, or sometimes in the United States #) is a unit of Mass A foot (plural feet or foot; symbol or abbreviation ft or sometimes &prime – the prime symbol) is a non-SI unit 880 25 Pa [8]
poundal per square footpdl/sq ft≡ 1 pdl/sq ft≈ 1. The poundal is a non- SI unit of Force. It is a part of the Foot-pound-second system of units a coherent subsystem of English units introduced A foot (plural feet or foot; symbol or abbreviation ft or sometimes &prime – the prime symbol) is a non-SI unit 488 164 Pa [8]
pound per square inchpsi≡ 1 lbf/in²≈ 6. The pound per square inch or more accurately pound-force per square inch (symbol psi or lbf/in² or lbf/in²) is a unit of 894 757 ×10+3 Pa [8]
short ton per square foot ≡ 1 sh tn × g / 1 sq ft≈ 95. Units of mass There are three similar units of Mass called the ton: Long ton (simply ton in countries such as the United A foot (plural feet or foot; symbol or abbreviation ft or sometimes &prime – the prime symbol) is a non-SI unit 760 518 ×10−3 Pa
torrtorr≡ 101 325/760 Pa≈ 133. The torr (symbol Torr) is a non- SI unit of Pressure defined as 1/760 of an atmosphere. 322 4 Pa [8]

### Torque

Torque
Name of unitSymbolDefinitionRelation to SI units
Newton metre (SI unit)N·m≡ N × m = kg·m²/s²= 1 N·m
foot-poundalft pdl≡ 1 lb·ft²/s²= 4. A torque (τ in Physics, also called a moment (of force is a pseudo- vector that measures the tendency of a force to rotate an object about Newton metre is the unit of moment ( Torque) in the SI system A foot (plural feet or foot; symbol or abbreviation ft or sometimes &prime – the prime symbol) is a non-SI unit 214 011 009 380 48×10−2 N·m
inch-pound forcein lbfg × 1 lb × 1 in= 0. The foot-pound force, or simply foot-pound (symbol ft·lbf or ft·lb) is a unit of work or Energy (a scalar 112 984 829 027 616 7 N·m
foot-pound forceft lbfg × 1 lb × 1 ft= 1. The foot-pound force, or simply foot-pound (symbol ft·lbf or ft·lb) is a unit of work or Energy (a scalar 355 817 948 331 400 4 N·m

### Energy

Energy
Name of unitSymbolDefinitionRelation to SI units
joule (SI unit)J≡ m·N = W·s = V·A·s = kg·m²/s²= 1 J
electronvolteVe × 1 V≈ 1. In Physics and other Sciences energy (from the Greek grc ἐνέργεια - Energeia, "activity operation" from grc ἐνεργός The joule (written in lower case ˈdʒuːl or /ˈdʒaʊl/ (symbol J) is the SI unit of Energy measuring heat, Electricity The elementary charge, usually denoted e, is the Electric charge carried by a single Proton, or equivalently the negative of the electric charge carried 602 176×10−19 J
rydbergRyR··c≈ 2. Johannes Robert Rydberg, (‘Janne’ to his friends ( November 8, 1854 &ndash December 28, 1919) was a Swedish Physicist The Rydberg Constant, named after the Swedish Physicist Johannes Rydberg, is a Physical constant relating to atomic spectra in the The Planck constant (denoted h\ is a Physical constant used to describe the sizes of quanta. 179 872×10−18 J
hartreeEh≡ me·α²·c² (= 2 Ry)≈ 4. A hartree (symbol E h is the atomic unit of Energy and is named after Physicist Douglas Hartree. The fine-structure constant or Sommerfeld fine-structure constant, usually denoted \alpha \ is the Fundamental physical constant characterizing 359 744×10−18 J
atomic unit of energyau≡ Eh≈ 4. Atomic units ( au) form a System of units convenient for Atomic physics, Electromagnetism, and Quantum electrodynamics, especially 359 744×10−18 J
erg (cgs unit)erg≡ 1 g·cm²/s²= 10−7 J
foot-poundalft pdl≡ 1 lb·ft²/s²= 4. An erg is the unit of Energy and Mechanical work in the centimetre-gram-second (CGS system of units symbol "erg" The centimetre-gram-second system ( CGS) is a system of physical units. A foot (plural feet or foot; symbol or abbreviation ft or sometimes &prime – the prime symbol) is a non-SI unit 214 011 009 380 48×10−2 J
cubic centimetre of atmosphere; standard cubic centimetrecc atm; scc≡ 1 atm × 1 cm³= 0. The Standard atmosphere is an international reference pressure defined as 101325 Pa and formerly used as unit of Pressure (symbol atm 101 325 J
inch-pound forcein lbfg × 1 lb × 1 in= 0. The foot-pound force, or simply foot-pound (symbol ft·lbf or ft·lb) is a unit of work or Energy (a scalar 112 984 829 027 616 7 J
foot-pound forceft lbfg × 1 lb × 1 ft= 1. The foot-pound force, or simply foot-pound (symbol ft·lbf or ft·lb) is a unit of work or Energy (a scalar 355 817 948 331 400 4 J
litre-atmospherel atm; sl≡ 1 atm × 1 L= 101. The litre or liter (see spelling differences) is a unit of Volume. The Standard atmosphere is an international reference pressure defined as 101325 Pa and formerly used as unit of Pressure (symbol atm 325 J
gallon-atmosphere (US)US gal atm≡ 1 atm × 1 gal (US)= 383. A gallon is a measure of Volume. It is in current use in the United States and still has limited use in many other English-speaking countries 556 849 013 8 J
gallon-atmosphere (imperial)imp gal atm≡ 1 atm × 1 gal (imp)= 460. A gallon is a measure of Volume. It is in current use in the United States and still has limited use in many other English-speaking countries 632 569 25 J
British thermal unit (thermochemical)BTUth≈ 1. 054 350 ×103 J
British thermal unit (ISO)BTUISO≡ 1. 0545 ×103 J
British thermal unit (63 °F)BTU63 °F≈ 1. 0546 ×103 J
British thermal unit (60 °F)BTU60 °F≈ 1. 054 68 ×103 J
British thermal unit (59 °F)BTU59 °F≡ 1. 054 804 ×103 J
British thermal unit (International Table)BTUIT= 1. 055 055 852 62 ×103 J
British thermal unit (mean)BTUmean≈ 1. 055 87 ×103 J
British thermal unit (39 °F)BTU39 °F≈ 1. 059 67 ×103 J
Celsius heat unit (International Table)CHUIT≡ 1 BTUIT × 1 K/°R= 1. The Celsius Temperature scale was previously known as the centigrade scale. 899 100 534 716 ×103 J
cubic foot of atmosphere; standard cubic footcu ft atm; scf≡ 1 atm × 1 ft³= 2. A foot (plural feet or foot; symbol or abbreviation ft or sometimes &prime – the prime symbol) is a non-SI unit A foot (plural feet or foot; symbol or abbreviation ft or sometimes &prime – the prime symbol) is a non-SI unit 869 204 480 934 4 ×103 J
cubic yard of atmosphere; standard cubic yardcu yd atm; scy≡ 1 atm × 1 yd³= 77. A yard (abbreviation yd) is a unit of Length in several different systems including English units Imperial units and United A yard (abbreviation yd) is a unit of Length in several different systems including English units Imperial units and United 468 520 985 228 8 ×103 J
cubic foot of natural gas ≡ 1000 BTUIT= 1. A foot (plural feet or foot; symbol or abbreviation ft or sometimes &prime – the prime symbol) is a non-SI unit 055 055 852 62 ×106 J
horsepower-hourhp·h≡ 1 hp × 1 h= 2. The hour (symbol h) is a unit of Time. It is not an SI unit but is accepted for use with the SI 684519537696172792 ×106 J
kilowatt-hour; Board of Trade UnitkW·h; B. O. T. U. ≡ 1 kW × 1 h= 3. 6 ×106 J
thermieth≡ 1 McalIT= 4. 1868 ×106 J
therm (U. S. ) ≡ 100 000 BTU59 °F= 105. 4804 ×106 J
therm (E. C. ) ≡ 100 000 BTUIT= 105. 505 585 262 ×106 J
ton of TNTtTNT≡ 1 Gcalth= 4. Units of mass There are three similar units of Mass called the ton: Long ton (simply ton in countries such as the United Trinitrotoluene ( TNT) is a Chemical compound with the formula C6H2(NO23CH3 184 ×109 J
barrel of oil equivalentbboe≈ 5. The barrel of oil equivalent (bboe sometimes BOE is a unit of energy based on the approximate energy released by burning one barrel of Crude oil. 8 MBTU59 °F≈ 6. 12 ×109 J
ton of coal equivalentTCE≡ 7 Gcalth= 29. 3076 ×109 J
ton of oil equivalentTOE≡ 10 Gcalth= 41. The tonne of oil equivalent ( toe) is a unit of energy: the amount of energy released by burning one Tonne of Crude oil, approximately 42 868 ×109 J
quad ≡ 1015 BTUIT= 1. A quad is a unit of energy equal to 1015 (a short-scale Quadrillion) BTU, or 1 055 055 852 62×1018 J

### Power

Power
Name of unitSymbolDefinitionRelation to SI units
watt (SI unit)W≡ J/s = N·m/s = kg·m²/s³= 1 W
luseclusec≡ 1 L·µmHg/s [10]≈ 1. In Physics, power (symbol P) is the rate at which work is performed or energy is transmitted or the amount of energy required or expended for The watt (symbol W) is the SI derived unit of power, equal to one Joule of energy per Second. 333×10−4 W
foot-pound-force per hourft lbf/h≡ 1 ft lbf/h≈ 3. A foot (plural feet or foot; symbol or abbreviation ft or sometimes &prime – the prime symbol) is a non-SI unit This article deals with the unit of force For the unit of mass see Pound (mass. The hour (symbol h) is a unit of Time. It is not an SI unit but is accepted for use with the SI 766 161×10−4 W
atmosphere cubic centimetre per minuteatm ccm≡ 1 atm × 1 cm³/min= 1. A minute is a Unit of measurement of Time or of Angle. The minute is a unit of Time equal to 1/60th of an Hour or 60 688 75×10−3 W
foot-pound-force per minuteft lbf/min≡ 1 ft lbf/min= 2. A foot (plural feet or foot; symbol or abbreviation ft or sometimes &prime – the prime symbol) is a non-SI unit This article deals with the unit of force For the unit of mass see Pound (mass. A minute is a Unit of measurement of Time or of Angle. The minute is a unit of Time equal to 1/60th of an Hour or 60 259 696 580 552 334×10−2 W
atmosphere–cubic centimetre per secondatm ccs≡ 1 atm × 1 cm³/s= 0. The second ( SI symbol s) sometimes abbreviated sec, is the name of a unit of Time, and is the International System of Units 101 325 W
BTU (International Table) per hourBTUIT/h≡ 1 BTUIT/h≈ 0. The hour (symbol h) is a unit of Time. It is not an SI unit but is accepted for use with the SI 293 071 W
atmosphere–cubic foot per houratm cfh≡ 1 atm × 1 cu ft/h= 0. A foot (plural feet or foot; symbol or abbreviation ft or sometimes &prime – the prime symbol) is a non-SI unit The hour (symbol h) is a unit of Time. It is not an SI unit but is accepted for use with the SI 797 001 244 704 W
foot-pound-force per secondft lbf/s≡ 1 ft lbf/s= 1. A foot (plural feet or foot; symbol or abbreviation ft or sometimes &prime – the prime symbol) is a non-SI unit This article deals with the unit of force For the unit of mass see Pound (mass. The second ( SI symbol s) sometimes abbreviated sec, is the name of a unit of Time, and is the International System of Units 355 817 948 331 400 4 W
litre-atmosphere per minuteL·atm/min≡ 1 atm × 1 L/min= 1. The litre or liter (see spelling differences) is a unit of Volume. A minute is a Unit of measurement of Time or of Angle. The minute is a unit of Time equal to 1/60th of an Hour or 60 688 75 W
calorie (International Table) per secondcalIT/s≡ 1 calIT/s= 4. This article is about the unit of energy For its use in Nutrition and Food labelling regulations, see the article on Food energy. The second ( SI symbol s) sometimes abbreviated sec, is the name of a unit of Time, and is the International System of Units 1868 W
BTU (International Table) per minuteBTUIT/min≡ 1 BTUIT/min≈ 17. A minute is a Unit of measurement of Time or of Angle. The minute is a unit of Time equal to 1/60th of an Hour or 60 584 264 W
atmosphere-cubic foot per minuteatm·cfm≡ 1 atm × 1 cu ft/min= 47. A foot (plural feet or foot; symbol or abbreviation ft or sometimes &prime – the prime symbol) is a non-SI unit A minute is a Unit of measurement of Time or of Angle. The minute is a unit of Time equal to 1/60th of an Hour or 60 820 074 682 24 W
square foot equivalent direct radiationsq ft EDR≡ 240 BTUIT/h≈ 70. A foot (plural feet or foot; symbol or abbreviation ft or sometimes &prime – the prime symbol) is a non-SI unit 337 057 W
litre-atmosphere per secondL·atm/s≡ 1 atm × 1 L/s= 101. 325 W
horsepower (metric)hp≡ 75 m kgf/s= 735. 498 75 W
horsepower (European electrical)hp≡ 75 kp·m/s= 736 W
horsepower (Imperial mechanical)hp≡ 550 ft lbf/s= 745. 699 871 582 270 22 W
horsepower (Imperial electrical)hp≡ 746 W
ton of air conditioning ≡ 1 t × 1005 J/kg × 1 °R/K ÷ 10 min≈ 844. Units of mass There are three similar units of Mass called the ton: Long ton (simply ton in countries such as the United 2 W
ponceletp≡ 100 m kgf/s= 980. The poncelet (p is an obsolete unit of power once used in France and replaced by cheval vapeur (cv metric Horsepower) 665 W
BTU (International Table) per secondBTUIT/s≡ 1 BTUIT/s= 1. The second ( SI symbol s) sometimes abbreviated sec, is the name of a unit of Time, and is the International System of Units 055 055 852 62×103 W
atmosphere-cubic foot per secondatm cfs≡ 1 atm × 1 cu ft/s= 2. A foot (plural feet or foot; symbol or abbreviation ft or sometimes &prime – the prime symbol) is a non-SI unit The second ( SI symbol s) sometimes abbreviated sec, is the name of a unit of Time, and is the International System of Units 869 204 480 934 4×103 W
ton of refrigeration (IT) ≡ 1 BTUIT × 1 sh tn/lb ÷ 10 min/s≈ 3. Units of mass There are three similar units of Mass called the ton: Long ton (simply ton in countries such as the United 516 853×103 W
ton of refrigeration (Imperial) ≡ 1 BTUIT × 1 lng tn/lb ÷ 10 min/s≈ 3. Units of mass There are three similar units of Mass called the ton: Long ton (simply ton in countries such as the United 938 875×103 W
boiler horsepowerbhp≈ 34. 5 lb/h × 970. 3 BTUIT/lb≈ 9. 810 657×103 W

### Angular momentum

Action, Angular momentum
Name of unitSymbolDefinitionRelation to SI units
SI unitJ·s≡ kg·m²/s= 1 J·s
atomic unit of actionau = /2π≈ 1. Atomic units ( au) form a System of units convenient for Atomic physics, Electromagnetism, and Quantum electrodynamics, especially The Planck constant (denoted h\ is a Physical constant used to describe the sizes of quanta. The Planck constant (denoted h\ is a Physical constant used to describe the sizes of quanta. IMPORTANT NOTICE Please note that Wikipedia is not a database to store the millions of digits of π please refrain from adding those to Wikipedia as it could cause technical problems 054 571 596×10−34 J·s
cgs uniterg·s= 10−7 J·s

### Electric current

Electric current
Name of unitSymbolDefinitionRelation to SI units
ampere(SI base unit)A1 A
esu per second; statampere (cgs unit)esu/s≡ (0. The centimetre-gram-second system ( CGS) is a system of physical units. Electric current is the flow (movement of Electric charge. The SI unit of electric current is the Ampere. The ampere, in practice often shortened to amp, (symbol A is a unit of Electric current, or amount of Electric charge per second The International System of Units (SI defines seven dimensionally independent SI base units. The centimetre-gram-second system ( CGS) is a system of physical units. 1 A·m/s) /c≈ 3. 335 641×10−10 A
electromagnetic unit; abampere (cgs unit)abamp≡ 10 A

### Electric charge

Electric charge
Name of unitSymbolDefinitionRelation to SI units
coulomb (SI unit)C≡ A·s= 1 C
atomic unit of chargeaue≈ 1. The centimetre-gram-second system ( CGS) is a system of physical units. The centimetre-gram-second system ( CGS) is a system of physical units. Electric charge is a fundamental conserved property of some Subatomic particles which determines their Electromagnetic interaction. The coulomb (symbol C) is the SI unit of Electric charge. It is named after Charles-Augustin de Coulomb. Atomic units ( au) form a System of units convenient for Atomic physics, Electromagnetism, and Quantum electrodynamics, especially The elementary charge, usually denoted e, is the Electric charge carried by a single Proton, or equivalently the negative of the electric charge carried 602 176 462×10−19 C
statcoulomb; franklin; electrostatic unit (cgs unit)statC; Fr; esu≡ (0. The statcoulomb ( statC) or franklin ( Fr) or electrostatic unit of charge ( esu) is the physical unit for Electrical The statcoulomb ( statC) or franklin ( Fr) or electrostatic unit of charge ( esu) is the physical unit for Electrical The centimetre-gram-second system ( CGS) is a system of physical units. 1 A·m) /c≈ 3. 335 641×10−10 C
abcoulomb; electromagnetic unit (cgs unit)abC; emu≡ 10 C
faradayF≡ 1 mol × NA·e≈ 96,485. The abcoulomb ( abC or aC) or electromagnetic unit of charge ( emu of charge) is the basic Physical unit of Electric charge The centimetre-gram-second system ( CGS) is a system of physical units. Michael Faraday, FRS ( September 22 1791 – August 25 1867) was an English The Avogadro constant (symbols L, N A also called Avogadro's number, is the number of "elementary entities" (usually Atoms The elementary charge, usually denoted e, is the Electric charge carried by a single Proton, or equivalently the negative of the electric charge carried 3383 C

### Electromotive force

Voltage, Electromotive force
Name of unitSymbolDefinitionRelation to SI units
volt (SI unit)V≡ kg·m²/(A·s³)= 1 V
abvolt (cgs unit)abV≡ 1×10−8 V
statvolt (cgs unit)statVc· (1 μJ/A·m)= 299. Electrical tension (or voltage after its SI unit, the Volt) is the difference of electrical potential between two points of an electrical The volt (symbol V) is the SI derived unit of electric Potential difference or Electromotive force. The centimetre-gram-second system ( CGS) is a system of physical units. The statvolt is the unit of Voltage and Electrical potential used in the Cgs system of units The centimetre-gram-second system ( CGS) is a system of physical units. 792 458 V

### Electrical resistance

Electrical resistance
Name of unitSymbolDefinitionRelation to SI units
ohm (SI unit)Ω≡ V/A= kg·m²/(A²·s³)

### Inductance

Inductance
Name of unitSymbolDefinitionRelation to SI units
henry (SI unit)H≡ (m²×kg)/(s²×A²) = (V×s)/A = (J×s²)/C² = (m²×kg)/C²= 1 H

### Dynamic viscosity

Dynamic viscosity
Name of unitSymbolDefinitionRelation to SI units
pascal second (SI unit)Pa·s≡ N·s/m² , kg/(m·s)= 1 Pa·s
poise (cgs unit)P≡ 10−1 Pa·s

### Kinematic viscosity

Kinematic viscosity
Name of unitSymbolDefinitionRelation to SI units
SI unitm²/s≡ m²/s= 1 m²/s
stokes (cgs unit)St≡ 10−4 m²/s

### Information entropy

Information entropy
Name of unitSymbolDefinitionRelation to SI units
SI unitJ/K≡ J/K= 1 J/K
nat; nip; nepitnatkB= 1. Electrical resistance is a ratio of the degree to which an object opposes an Electric current through it measured in Ohms Its reciprocal quantity is The ohm (symbol Ω) is the SI unit of Electrical impedance or in the Direct current case Electrical resistance, In Electrical circuits, any Electric current i produces a Magnetic field and hence generates a total Magnetic flux \Phi acting The henry (symbol H is the SI unit of Inductance. It is named after Joseph Henry (1797-1878 the American scientist who discovered electromagnetic Viscosity is a measure of the resistance of a Fluid which is being deformed by either Shear stress or Extensional stress. Viscosity is a measure of the resistance of a Fluid which is being deformed by either Shear stress or Extensional stress. The poise (symbol P pwɑːz is the unit of dynamic Viscosity in the Centimetre gram second system of units. The centimetre-gram-second system ( CGS) is a system of physical units. Viscosity is a measure of the resistance of a Fluid which is being deformed by either Shear stress or Extensional stress. Viscosity is a measure of the resistance of a Fluid which is being deformed by either Shear stress or Extensional stress. The centimetre-gram-second system ( CGS) is a system of physical units. A nat (sometimes also nit or even nepit) is a Logarithmic unit of Information or entropy, based on Natural logarithms and 3806505(23) × 10−23 J/K
bit; shannonbit; b; Sh≡ ln(2) × kB= 9. A bit is a binary digit, taking a value of either 0 or 1 Binary digits are a basic unit of Information storage and communication 569940(16) × 10−24 J/K
ban; hartleyban; Hart≡ ln(10) × kB= 3. A ban, sometimes called a hartley (symbol Hart) or a dit (abbreviation of d ecimal dig' it') is a Logarithmic unit which 1790653(53) × 10−23 J/K
nibble≡ 4 bits= 3. A nibble (often nybble) is the Computing term for a four- Bit aggregation or half an octet (an octet being an 8-bit Byte 8279760(64) × 10−23 J/K
byteB≡ 8 bits= 7. A byte (pronounced "bite" baɪt is the basic unit of measurement of information storage in Computer science. 655952(13) × 10−23 J/K
kilobyte (decimal)kB≡ 1000 B= 7. A kilobyte (derived from the SI prefix Kilo -, meaning 1000 is a unit of Information or Computer storage equal to either 1024 655952(13) × 10−20 J/K
kilobyte (kibibyte)KB; KiB≡ 1024 B= 7. A kilobyte (derived from the SI prefix Kilo -, meaning 1000 is a unit of Information or Computer storage equal to either 1024 A kibibyte (a contraction of ki lo bi nary byte) is a unit of Information or Computer storage, established by the International 839695(13) × 10−20 J/K

Often, information entropy is measured in shannons, whereas the (discrete) storage space of digital devices is measured in bits. Thus, uncompressed redundant data occupy more than one bit of storage per shannon of information entropy. The multiples of a bit listed above are usually used with this meaning. Other times the bit is used as a measure of information entropy and is thus a synonym of shannon.

### Temperature

Note: see Temperature conversion for more detail

Temperature
Name of unitSymbolDefinitionRelation to SI units
kelvin (SI base unit)K1 K
degree Celsius°C[K] = [°C] + 273. Kelvin Celsius (Centigrade Fahrenheit Rankine Delisle Newton Réaumur Temperature is a physical property of a system that underlies the common notions of hot and cold something that is hotter generally has the greater temperature The kelvin (symbol K) is a unit increment of Temperature and is one of the seven SI base units The Kelvin scale is a thermodynamic The International System of Units (SI defines seven dimensionally independent SI base units. The Celsius Temperature scale was previously known as the centigrade scale. 15
degree Rankine°R; °Ra[K] = [°R] × 5⁄9
degree Fahrenheit°F[K] = ([°F] + 459. Rankine is a thermodynamic (absolute temperature scale named after the Scottish Engineer and Physicist William John Macquorn Rankine Fahrenheit is a temperature scale named after Daniel Gabriel Fahrenheit (1686–1736 a German Physicist who proposed it in 1724 67) × 5⁄9
degree Delisle°De[K] = 373. 15 − [°De] × 2⁄3
degree Newton°N[K] = [°N] × 100⁄33 + 273. The newton (symbol N) is the SI derived unit of Force, named after Isaac Newton in recognition of his work on Classical 15
degree Réaumur°Ré[K] = [°Ré] × 5⁄4 + 273. "Réaumur" redirects here For other uses see Réaumur (disambiguation. 15
degree Rømer°Rø[K] = ([°Rø] − 7. Ole Christensen Rømer (o(ːlə ˈʁœːˀmɐ in Danish 25 September 1644, Århus – 19 September 1710, Copenhagen) 5) × 40⁄21 + 273. 15

Name of unitSymbolDefinitionRelation to SI units
Becquerel (SI base unit)Bq≡ disintegration per second s-1= 1 Bq
Rutherfordrd≡ 1 MBq= 1 * 106 Bq
curieCi≡ 3. Radioactive decay is the process in which an unstable Atomic nucleus loses energy by emitting ionizing particles and Radiation. The becquerel (symbol Bq) is the SI derived unit of radioactivity. The International System of Units (SI defines seven dimensionally independent SI base units. A CURIE (short for Compact URI) is an abbreviated URI expressed in CURIE syntax and may be found in both XML and non-XML grammars 7 * 109 Bq= 3. 7 * 109 Bq

Name of unitSymbolDefinitionRelation to SI units
Gray (SI base unit)Gy≡ 1gy = 1J/s = 1m2s-2= 1 Gy
Radrad≡ 0. Absorbed dose (also known as total ionizing dose, TID is a measure of the energy deposited in a medium by Ionizing radiation. The International System of Units (SI defines seven dimensionally independent SI base units. 01 Gy= 0. 01 Gy

Name of unitSymbolDefinitionRelation to SI units
Sievert (SI base unit)Sv= 1 Sv
Röntgen equivalent manrem≡ 0. The equivalent dose ( H T) is a measure of the Radiation dose to tissue where an attempt has been made to allow for the different relative biological The sievert (symbol Sv is the SI derived unit of dose equivalent. The International System of Units (SI defines seven dimensionally independent SI base units. The Röntgen ( roentgen) equivalent in man or rem (symbol rem) 01 Sv= 0. 01 Sv

## Software tools

Home and office computers come with converters in bundled spreadsheet applications or can access free converters via the Internet. Units and measurements can be easily converted using these tools, but only if the units are explicitly defined and the conversion is compatible (e. g. , cmHg to kPa).

### Free conversion software

• Units (Unix program) — a popular command-line utility. Units is a Unix Computer program for Conversion of units of quantities

### General commercial sources of converters

• Advanced electronic calculators have unit-conversion functionality. A calculator is device for performing mathematical calculations distinguished from a Computer by having a limited problem solving ability and an interface optimized for interactive
• Spreadsheet programs usually provide conversion functions or formulas or the user can write their own. A spreadsheet is a Computer application that simulates a paper worksheet In Computer science, a subroutine ( function, method, procedure, or subprogram) is a portion of code within a larger In Mathematics and in the Sciences a formula (plural formulae, formulæ or formulas) is a concise way of expressing information
• Commercial mathematical, scientific and technical applications often include converters.

## References

1. ^ "NIST Reference on Constants, Units, and Uncertainty."(2006). National Institute of Standards and Technology. Accessed 22 February 2008.
2. ^ a b National Bureau of Standards. (June 30, 1959). Refinement of values for the yard and the pound. Federal Register, viewed September 20, 2006 at National Geodetic Survey web site.
3. ^ International System of Units, 8th ed. (2006), Bureau International des Poids et Mesures, Section 4. The International Bureau of Weights and Measures ( Bureau international des poids et mesures, in French) is an international Standards organization, one 1 Table 8.
4. ^ P. Kenneth Seidelmann, Ed. (1992). Explanatory Supplement to the Astronomical Almanac. Sausalito, CA: University Science Books. p. 716 and s. v. parsec in Glossary.
5. ^ Barry N. Taylor, Ed. ,NIST Special Publication 330: The International System of Units (SI) (2001 Edition), Washington: U. S. Government Printing Office, 43,"The 12th Conference Generale des Poids et Mesures (CGPM)…declares that the word “liter” may be employed as a special name for the cubic decimeter".
6. ^ The Swiss Federal Office for Metrology gives Zentner on a German language web page[1] and quintal on the English translation of that page[2]; the unit is marked "spécifiquement suisse !"
7. ^ Rowlett, Russ. A Dictionary of Units of Measurement. Viewed October 14, 2006 at http://www.unc.edu/~rowlett/units/dictZ.html
8. ^ a b c d e f g h i j k l m n o Barry N. Events 1066 - Norman Conquest: Battle of Hastings - In England on Senlac Hill seven miles from Hastings, the forces Taylor, (April 1995), Guide for the Use of the International System of Units (SI) (NIST Special Publication 811), Washington, DC: U. S. Government Printing Office, pp. 57–68.
9. ^ Barry N. Taylor, (April 1995), Guide for the Use of the International System of Units (SI) (NIST Special Publication 811), Washington, DC: U. S. Government Printing Office, p. 5.
10. ^ Russ Rowlett. (2005). How Many: A Dictionary of Units of Measure. Viewed 5 November 2006 at http://www.unc.edu/~rowlett/units/
• Klein, Herbert. Events 1499 - Publication of the Catholicon in Treguier ( Brittany) 1988. The science of measurement: A historical survey. New York: Dover Publications.