NationMaster - Encyclopedia: Conversion of units

Updated 19 days 18 hours 18 minutes ago.

Conversion of units refers to conversion factors between different units of measurement for the same quantity. The former Weights and Measures office in Middlesex, England. ... Quantity is a kind of property which exists as magnitude or multitude. ...

Contents

1 Techniques

1.1 Dimensioned values

1.2 Rounding of results

2 Tables of conversion factors

2.1 Legend

2.2 Length

2.3 Area

2.4 Volume

2.5 Angle

2.6 Solid angle

2.7 Mass

2.8 Time

2.9 Speed or velocity

2.10 Acceleration

2.11 Force

2.12 Pressure or mechanical stress

2.13 Torque

2.14 Energy

2.15 Power

2.16 Angular momentum

2.17 Electric current

2.18 Electric charge

2.19 Electromotive force

2.20 Electrical resistance

2.21 Dynamic viscosity

2.22 Kinematic viscosity

2.23 Information entropy

2.24 Temperature

3 Software tools

3.1 Free conversion software

3.2 General commercial sources of converters

4 References

5 See also

6 External links

[edit] Techniques

[edit] 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.

[edit] 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). Rounding to n significant figures is a form of rounding. ...

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.

[edit] Tables of conversion factors

[edit] Legend

Legend
≡ definition

= exactly equal to

≈ approximately equal to

(digits) indicates the digits repeat infinitely

[edit] Length

Length
Name of unit Symbol Definition Relation to SI units

metre (SI base unit) m ≡ 1 m = 1 m

ångström Å = 0.1 nm ≡ 1×10⁻¹⁰ m

astronomical unit AU Mean distance from Earth to the Sun = 149 597 870 691 ± 30 m

atomic unit of length a₀ ≡ Bohr radius of hydrogen ≈ 5.29 177 208 59×10⁻¹¹ ± 3.6×10⁻²⁰ m^[1]

barley corn ≡ ⅓ in = 0.0846 m

Bohr radius a₀; b ≡ α/4πR_∞ ≈ 5.291 772 083×10⁻¹¹ ± 19×10⁻²⁰ m

cable length (Imperial) ≡ 608 ft = 185.3184 m

cable length (International) ≡ 1/10 nmi = 185.2 m

cable length (U.S.) ≡ 720 ft = 219.456 m

calibre cal ≡ 1 in = 0.000254 m

chain (Gunter's; Surveyor's) ch ≡ 66.0 ft (4 rods) = 20.1168 m

chain (Ramsden's; Engineer's) ch ≡ 100 ft = 30.48 m

cubit ≡ 18 in = 0.4572 m

ell ell ≡ 45 in = 1.143 m

fathom fm ≡ 6 ft = 1.8288 m

fathom fm ≈ 1/1000 nmi = 1.852 m

fermi fm ≡ 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) ≈ 0.304 799 735 m

foot (Clarke's; Cape) ft (Cla) ≈ 0.304 797 265 4 m

foot (Indian) ft Ind ≈ 0.304 799 514 m

foot (International) ft ≡ 12 inches = 1/3 yd = 0.3048 m

foot (Sear's) ft (Sear) ≈ 0.304 799 47 m

foot (U.S. Survey) ft (US) ≡ 1200/3937 m ^[2] ≈ 0.304 800 610 m

french; charriere F ≡ 1/3 mm = 3.3 ×10⁻⁴ m

furlong fur ≡ 10 chains = 660 ft =220 yd = 201.168 m

geographical mile ≡ 6082 ft = 1853.7936 m

hand ≡ 4 in = 0.1016 m

inch in ≡ 1/36 yd = 1/12 ft = 0.0254 m

league lea ≡ 3 mi = 4828.032 m

light-day ≡ 24 light-hours = 2.590 206 837 12×10¹³ m

light-hour ≡ 60 light-minutes = 1.079 252 848 8×10¹² m

light-minute ≡ 60 light-seconds = 1.798 754 748×10¹⁰ m

light-second ≡ 2.997 924 58×10⁸ m

light-year l.y. ≡ c₀ × 86 400 × 365.25 = 9.460 730 472 580 8×10¹⁵ m

line ln ≡ 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

micron µ ≡ 1×10⁻⁶ m

mil; thou mil ≡ 1×10⁻³ in = 2.54×10⁻⁵ m

mil (Sweden and Norway) mil ≡ 10 km = 10000 m

mile mi ≡ 1760 yd = 5280 ft = 1609.344 m

mile (U.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 league NL; nl ≡ 3 nmi = 5556 m

nautical mile(international) NM; nmi ≡ 1852 m ^[3] 1852 m

nautical mile (Admiralty) NM (Adm); nmi (Adm) ≡ 6080 ft ≡ 1853.184 m

pace ≡ 2.5 ft = 0.762 m

palm ≡ 3 in = 0.000 762 m

parsec pc = 3.08567782 ×10¹⁶ ± 6×10⁶ m ^[4]

point (ATA) pt ≡ 0.013837 in = 0.003 514 598 m

point (Didot; European) pt ≡ 0.00 376 065 m

point (metric) pt ≡ 3/8 mm = 0.00 375 m

point (PostScript) pt ≡ 1/72 in ≈ 0.00 352 778 m

quarter ≡ ¼ yd = 0.2286 m

rod; pole; perch rd ≡ 16 ½ ft = 5.0292 m

rope rope ≡ 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 mile mi ≡ 6087 ft = 1855.3176 m

twip twp ≡ 1/1440 in ≈ 1.763 889×10⁻⁵ m

x unit; siegbahn xu ≈ 1.0021×10⁻¹³ m

yard (International) yd ≡3 ft ≡ 36 in = 0.9144 m^[2]

For other uses of this word, see Length (disambiguation). ... Look up si, Si, SI in Wiktionary, the free dictionary. ... This article is about the unit of length. ... The SI system of units defines seven SI base units: physical units defined by an operational definition. ... An Ã¥ngstrÃ¶m or aangstroem (the official transliteration), or angstrom (symbol Ã…) is a non-SI unit of length that is internationally recognized, equal to 0. ... The astronomical unit (AU or au or a. ... Atomic units (au) form a system of units convenient for electromagnetism, atomic physics, and quantum electrodynamics, especially when the focus is on the properties of electrons. ... 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 , is the fundamental physical constant characterizing the strength of the electromagnetic interaction. ... The Rydberg constant, named after physicist Janne Rydberg, is a physical constant discovered when measuring the spectrum of hydrogen, and building upon results from Anders Jonas Ã…ngstrÃ¶m and Johann Balmer. ... A cable length is a nautical unit of measure, for which at least four definitions seem to exist: Common definition: 1/10 nautical mile, i. ... The word caliber (American English) or calibre (British English) comes from the Italian calibro, itself from the Arabic quâlib, meaning mould. ... As a unit of measurement within the Imperial system, the chain (surveyors chain, Gunters chain) is defined as 22 yards, 66 feet, or four rods. ... Edmund Gunter (1581 - December 10, 1626), English mathematician, of Welsh extraction, was born in Hertfordshire in 1581. ... As a unit of measurement within the Imperial system, the chain (surveyors chain, Gunters chain) is defined as 22 yards, 66 feet, or four rods. ... Jesse Ramsden (October 6, 1735 - November 5, 1800) was an English astronomical instrument maker. ... A foot (plural: feet or foot;[1] symbol or abbreviation: ft or, sometimes, â€² â€“ a prime) is a unit of length, in a number of different systems, including English units, Imperial units, and United States customary units. ... A foot (plural: feet or foot;[1] symbol or abbreviation: ft or, sometimes, â€² â€“ a prime) is a unit of length, in a number of different systems, including English units, Imperial units, and United States customary units. ... A foot (plural: feet or foot;[1] symbol or abbreviation: ft or, sometimes, â€² â€“ a prime) is a unit of length, in a number of different systems, including English units, Imperial units, and United States customary units. ... A foot (plural: feet or foot;[1] symbol or abbreviation: ft or, sometimes, â€² â€“ a prime) is a unit of length, in a number of different systems, including English units, Imperial units, and United States customary units. ... A foot (plural: feet or foot;[1] symbol or abbreviation: ft or, sometimes, â€² â€“ a prime) is a unit of length, in a number of different systems, including English units, Imperial units, and United States customary units. ... A foot (plural: feet or foot;[1] symbol or abbreviation: ft or, sometimes, â€² â€“ a prime) is a unit of length, in a number of different systems, including English units, Imperial units, and United States customary units. ... â€¹ The template below (Unit of length) is being considered for deletion. ... The geographical mile is a unit of length determined by 1 minute of arc along the Earths equator, approximately equal to 1855 metres (6087. ... An inch (plural: inches; symbol or abbreviation: in or, sometimes, â€³ - a double prime) is the name of a unit of length in a number of different systems, including English units, Imperial units, and United States customary units. ... For other uses, see league. ... A light day (also written light-day) is a unit of length. ... A light hour (also written light-hour) is a unit of length. ... A light minute (also written light-minute) is a unit of length. ... A light second is a unit of length. ... A light-year or lightyear (symbol: ly) is a unit of measurement of length, specifically the distance light travels in vacuum in one year. ... A micrometre (American spelling: micrometer, symbol Âµm) is an SI unit of length equal to one millionth of a metre, or about a tenth of the diameter of a droplet of mist or fog. ... A thou, also known as a mil, is a unit of length equal to one thousandth of an international inch. ... A mil (Norwegian and Swedish for mile) is a unit of length, usually used to measure geographic distance, fairly common in Norway and Sweden. ... â€œMilesâ€ redirects here. ... â€œMilesâ€ redirects here. ... A nautical mile or sea mile is a unit of length. ... A nautical mile or sea mile is a unit of length. ... A parsec is the distance from the Earth to an astronomical object which has a parallax angle of one arcsecond. ... For the literary term, see Postscript. ... A rod is a unit of length, equal to 5. ... â€œMilesâ€ redirects here. ... A twip (loosely from twentieth of a point) is a typographical measurement, defined as 1/20 of a typographical point. ... The X-unit (symbol xu) is a unit of length formerly used to measure the wavelength of X-rays and gamma rays. ... The X-unit (symbol xu) is a unit of length formerly used to measure the wavelength of X-rays and gamma rays. ... A yard (abbreviation: yd) is the name of a unit of length in a number of different systems, including English units, Imperial units, and United States customary units. ...

[edit] Area

Area
Name of unit Symbol Definition Relation to SI units

acre ac ≡ 10 sq ch = 4840 sq yd = 4046.856 422 4 m²

are a ≡ 100 m²

barn b ≡ 10⁻²⁸ m²

barony ≡ 4000 ac = 1.618 742 568 96×10⁷ m²

board bd ≡ 1 in × 1 ft = 7.741 92×10⁻³ m²

boiler horsepower equivalent direct radiation bhp EDR ≡ (1 ft²) (1 bhp) / (240 BTU_IT/h) ≈ 12.958 174 m²

circular inch circ in ≡ π/4 sq in ≈ 5.067 075×10⁻⁴ m²

circular mil; circular thou circ mil ≡ π/4 mil² ≈ 5.067 075×10⁻¹⁰ m²

cord ≡ 192 bd = 1.486 448 64 m²

dunam ≡ 1000 m² = 1000 m²

hectare ha ≡ 10 000 m² = 10 000 m²

hide ≡ 100 ac = 4.046 856 422 4×10⁵ m²

rood ro ≡ ¼ ac = 1011.714 105 6 m²

square chain sq ch ≡ 1 sq ch = 404.685 642 24 m²

square foot sq ft ≡ 1 sq ft = 9.290 304×10⁻² m²

square inch sq in ≡ 1 sq in = 6.4516×10⁻⁴ m²

square kilometre km² ≡ 1 km² = 10⁶ m²

square link sq lnk ≡ 1 lnk² = 4.046 856 422 4×10⁻² m²

square metre (SI unit) m² ≡ 1 m × 1 m = 1 m²

square mil; square thou sq mil ≡ 1 sq mil = 6.4516×10⁻¹⁰ m²

square mile; section sq mi ≡ 1 sq mi = 2.589 988 110 336×10⁶ m²

square rod/pole/perch sq rd ≡ 1 sq rd = 25.292 852 64 m²

square U.S. Survey foot sq ft ≡ 1 sq ft (US) ≈ 9.290 341 161 327 49×10^-2 m²

square U.S. Survey mile sq mi ≡ 1 sq mi (US) ≈ 2.589 998×10⁶ m²

square yard sq yd ≡ 1 sq yd = 0.836 127 36 m²

stremma ≡ 1000 m² = 1000 m²

township ≡ 36 sq mi (US) ≈ 9.323 994×10⁷ m²

yardland ≡ 30 ac = 1.214 056 926 72×10⁵ m²

Area is the measure of how much exposed area any two dimensional object has. ... Look up si, Si, SI in Wiktionary, the free dictionary. ... This article is about the unit of measurement. ... An are (symbol a) is a unit of area, equal to 100 square meters (10 m Ã— 10 m), used for measuring land area. ... A barn (symbol b) is a unit of area. ... An inch (plural: inches; symbol or abbreviation: in or, sometimes, â€³ - a double prime) is the name of a unit of length in a number of different systems, including English units, Imperial units, and United States customary units. ... A dunam or dÃ¶nÃ¼m, dunum, donum is a unit of area. ... A hectare (symbol ha) is a unit of area, equal to 10 000 square metres, commonly used for measuring land area. ... The hide was a variable unit of land area used in medieval England, defined according to its arable yield and taxable potential rather than its exact dimensions. ... A square foot is by definition the area enclosed by a square with sides each 1 foot long. ... A square inch is by definition the area enclosed by a square with sides each 1 inch long. ... Square kilometre (U.S. spelling: square kilometer), symbol kmÂ², is a decimal multiple of SI unit of surface area square metre, one of the SI derived units. ... A square metre (US spelling: square meter) is by definition the area enclosed by a square with sides each 1 metre long. ... This article is about the unit of length. ... â€œMilesâ€ redirects here. ... For other uses, see Foot (disambiguation). ... â€œMilesâ€ redirects here. ... -1... The stremma (Greek:ÏƒÏ„ÏÎÎ¼Î¼Î±, plural ÏƒÏ„ÏÎÎ¼Î¼Î±Ï„Î±) 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 land, that is nominally six (U.S. Survey) miles (~9. ...

[edit] Volume

Volume
Name of unit Symbol Definition Relation to SI units

acre foot ac ft ≡ 1 ac x 1 ft = 43560 ft³ = 1233.5 m³

cubic metre (SI unit) m³ ≡ 1 m × 1 m × 1 m = 1 m³

litre L ≡ 1 dm³ ^[5] = 0.001 m³

lambda λ ≡ 1 mm³ = 1 ×10⁻⁹ m³

drop (metric) ≡ 1/20 mL = 5 ×10⁻⁹ m³

minim (Imperial) min ≡ 1/480 fl oz (Imp) = 1/60 fl dr (Imp) ≈ 5.9 193 880 208 333 ×10⁻⁹ m³

minim (U.S.) min ≡ 1/480 US fl oz = 1/60 US fl dr = 6.1 611 519 921 875 ×10⁻⁹ m³

drop (U.S.) (alt) gtt ≡ 1/456 US fl oz ≈ 6.4 854 231 ×10⁻⁹ m³

drop (Imperial) (alt) gtt ≡ 1/1824 gi (Imp) ≈ 7.7 886 684 ×10⁻⁹ m³

drop (U.S.) gtt ≡ 1/360 US fl oz = 8.2 148 693 229 16 ×10⁻⁹ m³

drop (medical) ≡ 1/12 mL = 83 ×10⁻⁹ m³

drop (Imperial) gtt ≡ 1/288 fl oz (Imp) = 9.8 656 467 0138 ×10⁻⁹ m³

dash (U.S.) ≡ 1/96 US fl oz = ½ US pinch = 0.0308 057 599 609 375 ×10⁻⁶ m³

dash (Imperial) ≡ 1/384 gi (Imp) = ½ pinch (Imp) = 0.0369 961 751 302 083 ×10⁻⁶ m³

pinch (U.S.) ≡ 1/48 US fl oz = ⅛ US tsp = 0.0616 115 199 218 75 ×10⁻⁶ m³

pinch (Imperial) ≡ 1/192 gi (Imp) = ⅛ tsp (Imp) = 0.0739 923 502 604 16 ×10⁻⁶ m³

fluid scruple (Imperial) fl s ≡ 1/24 fl oz (Imp) = 0.1183 877 604 16 ×10⁻⁶ m³

fluid drachm (Imperial) fl dr ≡ ⅛ fl oz (Imp) = 0.3551 632 812 5 ×10⁻⁶ m³

fluid dram (U.S.); U.S. fluidram fl dr ≡ ⅛ US fl oz = 0.3696 691 195 312 5 ×10⁻⁶ m³

teaspoon (Canadian) tsp ≡ 1/6 fl oz (Imp) ≈ 0.4735 510 416 667 ×10⁻⁶ m³

teaspoon (U.S.) tsp ≡ 1/6 US fl oz = 0.4928 921 595 ×10⁻⁶ m³

teaspoon (metric) ≡ 0.5 ×10⁻⁶ m³

teaspoon (Imperial) tsp ≡ 1/24 gi (Imp) = 0.5919 388 020 83 ×10⁻⁶ m³

dessertspoon (Imperial) ≡ 1/12 gi (Imp) = 1.1838 776 0416 ×10⁻⁶ m³

tablespoon (Canadian) tbsp ≡ ½ fl oz (Imp) = 1.4206 531 25 ×10⁻⁶ m³

tablespoon (U.S.) tbsp ≡ ½ US fl oz = 1.4786 764 782 5 ×10⁻⁶ m³

tablespoon (metric) ≡ 1.5 ×10⁻⁶ m³

cubic inch cu in ≡ 1 cu in = 1.6387 064 ×10⁻⁶ m³

tablespoon (Imperial) tbsp ≡ 5/8 fl oz (Imp) = 1.7758 164 0625 ×10⁻⁶ m³

pony ≡ 3/4 US fl oz = 2.218 014 717 187 5 ×10⁻⁶ m³

fluid ounce (Imperial) fl oz (Imp) ≡ 1/160 gal (Imp) = 2.8413 062 5 ×10⁻⁶ m³

fluid ounce (U.S.) US fl oz ≡ 1/128 gal (US) = 2.9573 529 5625 ×10⁻⁶ m³

shot ≡ 1 US fl oz = 2.9573 529 5625 ×10⁻⁶ m³

jigger ≡ 1½ US fl oz = 4.4360 294 343 75 ×10⁻⁶ m³

gill (U.S.) gi (US) ≡ 4 US fl oz = 11.8294 118 25 ×10⁻⁶ m³

gill (Imperial); Noggin gi (Imp); nog ≡ 5 fl oz (Imp) = 14.2065 312 5 ×10⁻⁶ m³

cup (Canadian) c (CA) ≡ 8 fl oz (Imp) = 22.73045 ×10⁻⁶ m³

cup (U.S.) c (US) ≡ 8 US fl oz ≡ 1/16 gal (US) = 23.6588 2365 ×10⁻⁶ m³

cup (metric) c ≡ 25.0 ×10⁻⁶ m³

breakfast cup ≡ 10 fl oz (Imp) = 28.4130 625 ×10⁻⁶ m³

pint (U.S. fluid) pt (US fl) ≡ ⅛ gal (US) = 47.3176 473 ×10⁻⁶ m³

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.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-foot fbm ≡ 144 cu in = 0.002 359 737 216 m³

gallon (U.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 gallon beer gal ≡ 282 cu in = 0.004 621 152 048 m³

peck (U.S. dry) pk ≡ ¼ US lvl bu = 0.008 809 767 541 72 m³

peck (Imperial) pk ≡ 2 gal (Imp) = 0.009 092 18 m³

bucket (Imperial) bkt ≡ 4 gal (Imp) = 0.018 184 36 m³

timber foot ≡ 1 cu ft = 0.028 316 846 592 m³

cubic foot cu ft ≡ 1 ft × 1 ft × 1 ft = 0.028 316 846 592 m³

firkin ≡ 9 gal (US) = 0.034 068 706 056 m³

bushel (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) = 0.081 829 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.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) = 0.290 949 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) = 0.476 961 884 784 m³

perch per ≡ 16½ ft × 1½ ft × 1 ft = 0.700 841 953 152 m³

cubic yard cu yd ≡ 27 cu ft = 0.764 554 857 984 m³

tun ≡ 252 gal (wine) = 0.953 923 769 568 m³

displacement ton ≡ 35 cu ft = 0.991 089 630 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.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) = 2.909 497 6 m³

cord (firewood) ≡ 8 ft × 4 ft × 4 ft = 3.624 556 363 776 m³

cubic fathom cu fm ≡ 1 fm × 1 fm × 1 fm = 6.116 438 863 872 m³

acre-inch ≡ 1 ac × 1 in = 102.790 153 128 96 m³

acre-foot ≡ 1 ac × 1 ft = 1233.481 837 547 52 m³

cubic mile cu mi ≡ 1 cu mi = 4.168 181 825 440 579 584 ×10⁹ m³

For other uses, see Volume (disambiguation). ... Look up si, Si, SI in Wiktionary, the free dictionary. ... 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, canals, and river flows. ... The cubic meter (symbol mÂ³) is the SI derived unit of volume. ... The litre or liter (see spelling differences) is a unit of volume. ... Lambda (upper case Λ, lower case λ) is the 11th letter of the Greek alphabet. ... The drop is a unit of measure of volume. ... A minim is a small amount of fluid. ... ... Also see the article : Greek drachma. ... Also see the article : Greek drachma. ... Image:Teaspoon sugar. ... The most commonly used spoon in most houses the dessertspoon is probably what youre used to eating your breakfast with. ... This tablespoon has a capacity of about 1 tbsp. ... An inch (plural: inches; symbol or abbreviation: in or, sometimes, â€³ - a double prime) is the name of a unit of length in a number of different systems, including English units, Imperial units, and United States customary units. ... A fluid ounce is a unit of volume in both the Imperial system of units and the U.S. customary units system. ... For other uses, see Gill (disambiguation). ... The cup is a unit of measurement for volume, used in cooking to measure bulk foods, such as chopped vegetables (dry measurement), and liquids (fluid measurement). ... The pint is an English unit of volume or capacity in the imperial system and United States customary units, equivalent in each system to one half of a quart, and one eighth of a gallon. ... For other uses, see Quart (disambiguation). ... The board-foot is a specialized unit of volume for measuring lumber in the United States and Canada. ... The gallon (abbreviation: gal) is a unit of volume. ... A 1/2 peck apple bag A peck is an Imperial and U.S. customary unit of dry volume, equivalent in each of these systems to 8 dry quarts, or 16 dry pints. ... A 1/2 peck apple bag A peck is an Imperial and U.S. customary unit of dry volume, equivalent in each of these systems to 8 dry quarts, or 16 dry pints. ... A bucket (bkt. ... It has been suggested that Thousand Cubic Feet be merged into this article or section. ... A Firkin is an old English unit of volume. ... A table of weights from the secretaries of the different states, showing the no. ... The kilderkin is an old English unit of brewery casks, holding about 82 litres. ... The word sack can refer to: Look up sack in Wiktionary, the free dictionary. ... â€œbblâ€ redirects here. ... Coomb may refer to: Coomb, a rare Celtic Brythonic survival word; meaning a small deep dry valley, easily defended. ... A hogshead is a large cask of liquid (less often, of a food commodity). ... Seam may mean: A seam, in sewing, is the line where two or more layers of fabric are held together by thread. ... This article is about the physical container. ... The butt (from the medieval French and Italian ) or pipe is an old English unit of wine casks, holding about 477 litres or rather two hogsheads. ... Species P. flavescens (Yellow perch) P. fluviatilis (European perch) P. schrenkii (Balkhash perch) For other meanings of the word perch, including fish not in the Perca genus, see Perch (disambiguation). ... A yard (abbreviation: yd) is the name of a unit of length in a number of different systems, including English units, Imperial units, and United States customary units. ... Look up ton in Wiktionary, the free dictionary. ... Look up ton in Wiktionary, the free dictionary. ... 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 or 256 pounds. ... For other uses, see Last (disambiguation). ... Firewood, stacked to dry Bags of firewood logged from the Barmah Forest in Victoria Wood fuel is wood used as fuel. ... A fathom is the name of a unit of length in the Imperial system (and the derived U.S. customary units). ... 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, canals, and river flows. ... â€œMilesâ€ redirects here. ...

[edit] Angle

Angle
Name of unit Symbol Definition Relation to SI units

radian rad ≡ 180°/π 1 rad

centesimal second of arc " ≡ 1 grad/10000 ≈ 1.57 079 6×10⁻⁶ rad

arcsecond " ≡ 1°/3600 ≈ 4.84 813 7×10⁻⁶ rad

centesimal minute of arc ' ≡ 1 grad/100 ≈ 15.708 0×10⁻⁶ rad

minute of arc ' ≡ 1°/60 ≈ 29.088 8×10⁻⁶ rad

angular mil µ ≡ 2π/6400 rad ≈ 98.174 8×10⁻⁶ rad

grad; gradian; gon grad ≡ 2π/400 rad = 0.9° ≈ 1.570 796 3×10⁻³ rad

degree (of arc) ° ≡ π/180 rad ≈ 1.745 329 3×10⁻³ rad

sign ≡ 30° ≈ 0.523 599 rad

octant ≡ 45° ≈ 0.785 398 rad

sextant ≡ 60° ≈ 1.047 198 rad

quadrant ≡ 90° ≈ 1.570 796 rad

This article is about angles in geometry. ... Look up si, Si, SI in Wiktionary, the free dictionary. ... For the musical group, see Radian (band). ... A second of arc or arcsecond is a unit of angular measurement which comprises one-sixtieth of an arcminute, or 1/3600 of a degree of arc or 1/1296000 ≈ 7. ... A second of arc or arcsecond is a unit of angular measurement which comprises one-sixtieth of an arcminute, or 1/3600 of a degree of arc or 1/1296000 â‰ˆ 7. ... A minute of arc, arcminute, or MOA is a unit of angular measurement, equal to one sixtieth (1/60) of one degree. ... A minute of arc, arcminute, or MOA is a unit of angular measurement, equal to one sixtieth (1/60) of one degree. ... The mil (in full, angular mil) is a unit of angular measure. ... The grad is a measurement of plane angles of value 1/400 of a full circle, thus dividing a right angle in 100. ... The gon is a measurement of plane angles, corresponding to 1/400 of a full circle, thus dividing a right angle in 100. ... The gon is a measurement of plane angles, corresponding to 1/400 of a full circle, thus dividing a right angle in 100. ... This article describes the unit of angle. ... Can refer to a region of Euclidean 3-space with a specific sign for x, y and z coordinates. ... Look up Quadrant on Wiktionary, the free dictionary Quadrant can mean: HMS Quadrant (G11), a WW-II British/Australian warship. ...

[edit] Solid angle

Solid angle
Name of unit Symbol Definition Relation to SI units

steradian sr (SI derived unit)

A solid angle is the three dimensional analog of the ordinary angle. ... Look up si, Si, SI in Wiktionary, the free dictionary. ... The steradian (ste from Greek stereos, solid) is the SI derived unit of solid angle, and the 3-dimensional equivalent of the radian. ... SI derived units are part of the SI system of measurement units and are derived from the seven SI base units. ...

[edit] Mass

Note: see Weight for detail of mass/weight distinction and conversion For other uses, see Weight (disambiguation). ...

Mass
Name of unit Symbol Definition Relation to SI units

kilogram, grave(SI base unit) kg; G = 1kg

electron rest mass m_e ≈ 9.109 381 88×10⁻³¹ ± 72×10⁻³⁹ kg

atomic unit of mass amu^{[citation needed]} ≡ m_e ≈ 9.109 381 88×10⁻³¹ ± 72×10⁻³⁹ kg

unified atomic mass unit u ≈ 1.660 538 73×10⁻²⁷ ± 13×10⁻³⁵ kg

dalton Da ≈ 1.660 902 10×10⁻²⁷ ± 13×10⁻³⁵ kg

gamma γ ≡ 1 ×10⁶ kg

point ≡ 1/100 kt (metric) = 2 ×10⁶ kg

mite ≡ 1/20 gr = 3.239 945 5 ×10⁶ kg

mite (metric) ≡ 1/20 g = 50 ×10⁶ kg

grain gr ≡ 64.798 91 ×10⁶ kg

crith ≈ 89.9349 ×10⁶ kg

carat (metric) ct ≡ 200 ×10⁶ kg

carat kt ≡ 3 1/6 gr ≈ 205.196 548 333 ×10⁶ kg

sheet ≡ 1/700 lb av = 647.9891 ×10⁶ kg

scruple (apothecary) s ap ≡ 20 gr = 1.295 978 2 ×10³ kg

pennyweight dwt; pwt ≡ 1/20 oz t = 1.555 173 84 ×10³ kg

dram (avoirdupois) dr av ≡ 27 11/32 gr = 1.771 845 195 312 5 ×10³ kg

dram (apothecary; troy) dr t ≡ 60 gr = 3.887 934 6 ×10³ kg

hyl (CGS unit) ≡ 1 gee × 1 g × 1 s²/m = 9.806 65 ×10³ kg

ounce (avoirdupois) oz av ≡ 1/16 lb = 28.349 523 125 ×10³ kg

assay ton (short) AT ≡ 1 mg × 1 sh tn ÷ 1 oz t ≈ 29.166 667 ×10³ kg

ounce (apothecary; troy) oz t ≡ 1/12 lb t = 31.103 476 8 ×10³ kg

assay ton (long) AT ≡ 1 mg × 1 long tn ÷ 1 oz t ≈ 32.666 667 ×10³ kg

mark ≡ 8 oz t = 248.827 814 4 ×10³ kg

pound (troy) lb t ≡ 5760 grains = 0.373 241 721 6 kg

pound (avoirdupois) lb av ≡ 7000 grains = 0.453 592 37 kg

pound (metric) ≡ 500 ×10³ kg

clove ≡ 8 lb av = 3.628 738 96 kg

stone st ≡ 14 lb av = 6.350 293 18 kg

hyl (MKS unit) ≡ 1 gee × 1 kg × 1 s²/m = 9.806 65 kg

quarter (Imperial) ≡ 1/4 long cwt = 2 st = 28 lb av = 12.700 586 36 kg

slug; geepound slug ≡ 1 gee × 1 lb av × 1 s²/ft ≈ 14.593 903 kg

bag (Portland cement) ≡ 94 lb av = 42.637 682 78 kg

short hundredweight; cental sh cwt ≡ 100 lb av = 45.359 237 kg

long hundredweight long cwt or cwt ≡ 112 lb av = 50.802 345 44 kg

bag (coffee) ≡ 60 kg = 60 kg

quintal (metric) q ≡ 100 kg

wey ≡ 252 lb = 18 st (variants exist) = 114.305 277 24 kg

long quarter (informal) ≡ ¼ long tn = 254.011 727 2 kg

quarter (informal) ≡ ¼ short tn = 226.796 185 kg

kip kip ≡ 1000 lb av = 453.592 37 kg

short ton sh tn ≡ 2000 lb = 907.184 74 kg

tonne (mts unit) t ≡ 1000 kg

long ton long tn or ton ≡ 2240 lb = 1016.046 908 8 kg

barge ≡ 22 ½ sh tn = 20,411.656 65 kg

Zentner Ztr. 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). It should not be read as the mongrel unit "pound metre". For other uses, see Mass (disambiguation). ... Look up si, Si, SI in Wiktionary, the free dictionary. ... Kg redirects here. ... now. ... The SI system of units defines seven SI base units: physical units defined by an operational definition. ... For other uses, see Electron (disambiguation). ... Atomic units (au) form a system of units convenient for electromagnetism, atomic physics, and quantum electrodynamics, especially when the focus is on the properties of electrons. ... The atomic mass unit (amu), unified atomic mass unit (u), or dalton (Da), is a small unit of mass used to express atomic masses and molecular masses. ... The unified atomic mass unit (u), or dalton (Da), is a small unit of mass used to express atomic masses and molecular masses. ... A grain is a unit of mass equal to 0. ... The carat is a unit of mass used for measuring gems and pearls, and is exactly 200 milligrams. ... The carat is a unit of mass used for measuring gems and pearls, and is exactly 200 milligrams. ... The apothecaries system of mass is an obsolete system formerly used by apothecaries (now called pharmacists or chemists) in English-speaking countries. ... Interior of an apothecarys shop. ... A pennyweight (dwt) is an unit of mass which is the same as 24 grains, 1/240th of a troy pound, 1/20th of a troy ounce, approximately 0. ... The avoirdupois (IPA: ; French IPA: ) system is a system of weights (or, properly, mass) based on a pound of sixteen ounces. ... Also see the article : Greek drachma. ... Troy ounce is a traditional unit of gold weight. ... For other meanings, see Slug (disambiguation) The slug is an English and U.S. customary unit of mass. ... This article is about Ounce (unit of mass). ... Troy weight is a system of units of mass customarily used for precious metals and gemstones. ... Look up pound in Wiktionary, the free dictionary. ... Look up pound in Wiktionary, the free dictionary. ... Look up pound in Wiktionary, the free dictionary. ... The stone is a unit of mass in the Imperial system of weights and measures used in the United Kingdom, Ireland, and most Commonwealth countries. ... For other meanings, see Slug (disambiguation) The slug is an English and U.S. customary unit of mass. ... Sampling fast set Portland cement Portland cement is the most common type of cement in general usage, as it is a basic ingredient of concrete, mortar and plaster. ... Hundred weight or hundredweight is a unit of measurement for mass in both the system of measurement used in the United Kingdom (and previously throughout the British Commonwealth), and in the system used in the United States. ... Hundred weight or hundredweight is a unit of measurement for mass in both the system of measurement used in the United Kingdom (and previously throughout the British Commonwealth), and in the system used in the United States. ... For other uses, see Coffee (disambiguation). ... The quintal is a historical unit of mass with many different definitions in different countries. ... 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 or 256 pounds. ... In the United States, a kip is a unit of force that equals 1,000 pounds, i. ... The short ton is a unit of mass equal to 907. ... This article is about the metric tonne. ... The metre-tonne-second or mts system of units is a system of physical units introduced in the Soviet Union in 1933, but abolished in 1955. ... A long ton is the name used in the US for the unit called the ton in the avoirdupois or Imperial system of measurements, as used (alongside the metric system) in the United Kingdom and to some extent in other Commonwealth countries. ... A magnet levitating above a high-temperature superconductor demonstrates the Meissner effect. ... Look up pound in Wiktionary, the free dictionary. ... The pound-force is a non-SI unit of force or weight (properly abbreviated lbf or lbf). The pound-force is equal to a mass of one pound multiplied by the standard acceleration due to gravity on Earth (which is defined as exactly 9. ...

[edit] Time

Time, t
Name of unit Symbol Definition Relation to SI units

second(SI base unit) s = 1 s

Planck time ≡ (G ℏ/c⁵)^½ ≈ 1.351 211 818×10⁻⁴³ s

atomic unit of time au ≡ a₀/(α·c) ≈ 2.418 884 254×10⁻¹⁷ s

svedberg S ≡ 10⁻¹³ s = 100 fs

shake ≡ 10⁻⁸ s = 10 ns

sigma ≡ 10⁻⁶ s = 1 μs

jiffy ≡ 1/60 s ≈ .016667 s

jiffy (alternate) ≡ 1/100 s = 10 ms

helek ≡ 1/1080 h ≈ 3.333333 s

minute min ≡ 60 s

milliday md ≡ 86 400 s / 1000 ≡ 86.4 s

moment ≡ 90 s ≡ 90 s

ke(traditional) ≡ 1/100 d ≡ 864 s

quarter (of an hour) ke ≡ 1/96 d ≡ 900 s

hour h ≡ 60 min = 3600 s

day d ≡ 24 h = 86 400 s

week wk ≡ 7 d = 604 800 s

fortnight ≡ 2 wk = 1 209 600 s

month (hollow) mo ≡ 29 d = 2 505 600 s

month mo ≡ 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 ≡ 365.2425 d = 31 556 952 s

year (Julian) a, y, or yr ≡ 365.25 d = 31 557 600 s

sidereal year a, y, or yr ≡ 365.256363 d = 31 558 149.76 s

Olympiad ≡ 4 a of 365 d = 1.2614×10⁸ s

lustre; lustrum ≡ 5 a of 365 d = 1.5768×10⁸ s

octaeteris ≡ 8 a of 365 d = 2.522 88×10⁸ s

decade ≡ 10 a of 365 d = 3.1536×10⁸ s

enneadecaeteris; Metonic cycle ≡ 110 mo (hollow) + 125 mo (full) = 19 a of 365 d = 5.996 16×10⁸ s

Callippic cycle ≡ 441 mo (hollow) + 499 mo (full) = 76 a of 365.25 d = 2.398 377 6×10⁹ s

century (Calendar) ≡ 100 a of 365 d = 3.1536×10⁹ s

century (Julian) ≡ 100 a of 365.25 d = 3.155 76×10⁹ s

Hipparchic cycle ≡ 4 Callippic cycles - 1 d = 9.593 424×10⁹ s

millennium (Calendar) ≡ 1000 a of 365 d = 3.1536×10¹⁰ s

millennium (Gregorian) ≡ 1000 a of 365.2425 d = 3.155 695 2×10¹⁰ s

millennium (Julian) ≡ 1000 a of 365.25 d = 3.155 76×10¹⁰ s

Sothic cycle ≡ 1461 a of 365 d = 4.607 409 6×10¹⁰ s

This article is about the concept of time. ... Look up si, Si, SI in Wiktionary, the free dictionary. ... This article is about the unit of time. ... The SI system of units defines seven SI base units: physical units defined by an operational definition. ... In physics, the Planck time (tP), is the unit of time in the system of natural units known as Planck units. ... The gravitational constant G is a key element in Newtons law of universal gravitation. ... Plancks constant, denoted h, is a physical constant that is used to describe the sizes of quanta. ... The speed of light in a vacuum is an important physical constant denoted by the letter c for constant or the Latin word celeritas meaning swiftness.[1] It is the speed of all electromagnetic radiation, including visible light, in a vacuum. ... Atomic units (au) form a system of units convenient for electromagnetism, atomic physics, and quantum electrodynamics, especially when the focus is on the properties of electrons. ... 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 , is the fundamental physical constant characterizing the strength of the electromagnetic interaction. ... A Svedberg (symbol S, sometimes Sv) is a non-SI physical unit used in ultracentrifugation. ... The helek (Hebrew, meaning portion, plural halakim) is a unit of time used in the calculation of the Hebrew calendar. ... A minute is a unit of time equal to 1/60th of an hour and to 60 seconds. ... 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 metric prefixes, such as kiloseconds and milliseconds. ... Ke (åˆ») is a traditional decimal time unit equalling 14. ... Ke (åˆ») is a traditional decimal time unit equalling 14. ... The hour (symbol: h) is a unit of time. ... Look up day in Wiktionary, the free dictionary. ... For more details on each day of the week, see days of the week. ... Look up fortnight in Wiktionary, the free dictionary. ... Look up Month in Wiktionary, the free dictionary. ... Look up Month in Wiktionary, the free dictionary. ... Look up Month in Wiktionary, the free dictionary. ... A year (from Old English gÄ“r) is the time between two recurrences of an event related to the orbit of the Earth around the Sun. ... A year (from Old English gÄ“r) is the time between two recurrences of an event related to the orbit of the Earth around the Sun. ... A year (from Old English gÄ“r) is the time between two recurrences of an event related to the orbit of the Earth around the Sun. ... The sidereal year is the time for the Sun to return to the same position in respect to the stars of the celestial sphere. ... An Olympiad is a period of four years, associated with the Olympic Games of Classical Greece. ... In astronomy, an octaeteris is the period of eight solar years after which the moon phase occurs on the same day of the year plus one or two days. ... For other senses of this word, see decade (disambiguation). ... The Metonic cycle or Enneadecaeteris in astronomy and calendar studies is a particular approximate common multiple of the tropical year and the synodic month. ... The Metonic cycle or Enneadecaeteris in astronomy and calendar studies is a particular approximate common multiple of the year (specifically, the seasonal tropical year) and the synodic month. ... Eclipses may occur repeatedly, separated by some specific interval of time: this interval is called an eclipse cycle. ... A century (From the Latin cent, one hundred) is one hundred consecutive years. ... A century (From the Latin cent, one hundred) is one hundred consecutive years. ... Eclipses may occur repeatedly, separated by some specific interval of time: this interval is called an eclipse cycle. ... A millennium (pl. ... A millennium (pl. ... A millennium (pl. ... The Sothic cycle or Canicular period is a period of 1461 ancient Egyptian years (of 365 days) or 1460 Julian years (averaging 365. ...

[edit] Speed or velocity

Speed
Name of unit Symbol Definition Relation to SI units

metre per second (SI unit) m/s ≡ 1 m/s

foot per hour fph ≡ 1 ft/h ≈ 8.466 667×10⁻⁵ m/s

furlong per fortnight ≡ furlong/fortnight ≈ 1.663 095×10⁻⁴ m/s

inch per minute ipm ≡ 1 in/min ≈ 4.23 333×10⁻⁴ m/s

foot per minute fpm ≡ 1 ft/min = 5.08×10⁻³ m/s

inch per second ips ≡ 1 in/s = 2.54×10⁻² m/s

kilometre per hour km/h ≡ 1 km/h ≈ 2.777 778×10⁻¹ m/s

foot per second fps ≡ 1 ft/s = 3.048×10⁻¹ m/s

mile per hour mph ≡ 1 mi/h = 0.447 04 m/s

knot kn ≡ 1 NM/h = 1.852 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 minute mpm ≡ 1 mi/min = 26.8224 m/s

mile per second mps ≡ 1 mi/s = 1.609 344 km/s = 1609.344 m/s

speed of light in vacuum c ≡ 2.997 924 58×10⁸ m/s = 2.997 924 58×10⁸ m/s

speed of sound in air s ≡ 770 mph = 1230 km/h ≈ 344 m/s

A velocity consists of a speed combined with a direction; the speed part of the velocity takes units of speed. This article does not cite any references or sources. ... Look up si, Si, SI in Wiktionary, the free dictionary. ... Metre per second (U.S. spelling: meter per second) is an SI derived unit of both speed (scalar) and velocity (vector), defined by distance in metres divided by time in seconds. ... A foot (plural: feet or foot;[1] symbol or abbreviation: ft or, sometimes, â€² â€“ a prime) is a unit of length, in a number of different systems, including English units, Imperial units, and United States customary units. ... The hour (symbol: h) is a unit of time. ... â€¹ The template below (Unit of length) is being considered for deletion. ... Look up fortnight in Wiktionary, the free dictionary. ... An inch (plural: inches; symbol or abbreviation: in or, sometimes, â€³ - a double prime) is the name of a unit of length in a number of different systems, including English units, Imperial units, and United States customary units. ... A minute is a unit of time equal to 1/60th of an hour and to 60 seconds. ... A foot (plural: feet or foot;[1] symbol or abbreviation: ft or, sometimes, â€² â€“ a prime) is a unit of length, in a number of different systems, including English units, Imperial units, and United States customary units. ... A minute is a unit of time equal to 1/60th of an hour and to 60 seconds. ... An inch (plural: inches; symbol or abbreviation: in or, sometimes, â€³ - a double prime) is the name of a unit of length in a number of different systems, including English units, Imperial units, and United States customary units. ... This article is about the unit of time. ... Kilometre per hour (American spelling: kilometer per hour) is a unit of both speed (scalar) and velocity (vector). ... A foot (plural: feet or foot;[1] symbol or abbreviation: ft or, sometimes, â€² â€“ a prime) is a unit of length, in a number of different systems, including English units, Imperial units, and United States customary units. ... This article is about the unit of time. ... Miles per hour is a unit of speed, expressing the number of international miles covered per hour. ... A knot is a unit of speed abbreviated kt or kn. ... A nautical mile or sea mile is a unit of length. ... A knot is a unit of speed abbreviated kt or kn. ... â€œMilesâ€ redirects here. ... A minute is a unit of time equal to 1/60th of an hour and to 60 seconds. ... â€œMilesâ€ redirects here. ... This article is about the unit of time. ... The speed of light in a vacuum is an important physical constant denoted by the letter c for constant or the Latin word celeritas meaning swiftness.[1] It is the speed of all electromagnetic radiation, including visible light, in a vacuum. ... For other uses, see Speed of sound (disambiguation). ... This article is about velocity in physics. ...

[edit] Acceleration

Acceleration
Name of unit Symbol Definition Relation to SI units

metre per second squared (SI unit) m/s² ≡ 1 m/s² = 1 m/s²

foot per hour per