- Å
-
A symbol for the measurement unit Ångström.
- Ångström
-
A unit of length defined as exactly 1x10-10 meters.
Symbol: Å.
- µ
-
(1) A symbol for the measurement unit prefix micro.
(2) A symbol for the measurement unit micron.
- a
-
(1) A symbol for the measurement unit prefix atto.
(2) A symbol for the measurement unit are, a unit of area.
- acre
-
A unit of area defined as 43,560 square feet and equivalent to 4.046873x103 square meters.
- acre foot
-
A unit of volume equivalent to 1.2335x103 cubic meters.
- are
-
A unit of area defined as exactly 100 square meters.
Symbol: a.
- area
-
A class of derived unit constructed by multiplying together two units of length.
- astronomical unit
-
A unit of length equivalent to 1.495979x1011 meters.
- atto
-
A unit prefix equivalent to 10-18.
Symbol: a.
- b
-
Symbol for the measurement unit barn.
- bag
-
A unit of volume equivalent to 12 pecks.
- barn
-
A unit of reaction probability expressed as an area and defined as exactly 10-28 square meters, or commonly as 10-24 square centimeters.
Symbol: b.
- barrel
-
(1) For petroleum it is a unit of volume equivalent to 42 gallons.
(2) For spirits it is a unit of volume equivalent to 40 gallons.
(3) For wine it is a unit of volume equivalent to 31.5 gallons.
(4) For beer it is a unit of volume equivalent to 31 gallons.
(5) For shipping it is a unit of volume equivalent to 5 cubic feet.
- bite
-
A unit of length equivalent to 25 inches.
- board foot
-
A unit of volume equivalent to 2.359737x10-3 cubic meters.
- bolt
-
(1) For cotton it is a unit of length equivalent to 40 yards.
(2) For wool it is a unit of length equivalent to 70 yards.
- British standard
-
A unit of volume equivalent to 165 cubic feet.
- bushel
-
A unit of volume equivalent to 3.523907x10-2 cubic meters.
- c
-
(1) A symbol for the measurement unit prefix centi.
(2) A symbol for the measurement unit carat, a unit of mass.
(3) An early symbol for the measurement unit curie, a unit of radioactivity.
- C
-
(1) A symbol for the measurement unit coulomb, a unit of electrical charge.
(2) A symbol for the measurement unit Celsius, a unit of temperature.
(3) An early symbol for the measurement unit curie, a unit of radioactivity.
- cable length
-
A unit of length equivalent to 120 fathoms.
- centi
-
A measurement unit prefix equivalent to 10-2.
Symbol: c.
- cc
-
A symbol for cubic centimeter.
- circular mil
-
A unit of area equivalent to 5.067075x10-10 square meters.
- cm3
-
A symbol for cubic centimeter.
- cord
-
A unit of volume equivalent to 3.624556 cubic meters.
- cord foot
-
A unit of volume equivalent to 16 cubic feet.
- cubic centimeter
-
A unit of volume defined as exactly 1x10-3 liters and as exactly 1x10-6 cubic meters.
Symbols: cm3; cc.
- cubic foot
-
A unit of volume equivalent to 2.831685x103 cubic meters.
Symbol: ft3.
- cubic inch
-
A unit of volume equivalent to 1.638706x10-5 cubic meters.
Symbol: in3.
- cubic meter
-
The SI standard unit of volume.
Symbol: m3.
- cubic mile
-
A unit of volume equivalent to 4.168182x109 cubic meters.
Symbol: mi3.
- cubic yard
-
A unit of volume equivalent to 7.645549x10-1 cubic meters.
Symbol: yd3.
- cubit
-
A unit of length equivalent to 18 inches.
- cut
-
A unit of length equivalent to 300 yards.
- d
-
(1) A symbol for the measurement unit prefix deci.
(2) A symbol for the measurement unit day, a unit of time.
- day
-
A unit of time defined as exactly 86,400 sseconds, and as exactly 1,400 minutes, and as exactly 24 hours.
Symbol: d.
- da
-
A symbol for the measurement unit prefix deka.
- darcy
-
A unit of area equivalent to 9.869233x10-13 square meters.
- deci
-
A measurement unit prefix equivalent to 10-1.
Symbol: d.
- degree
-
(1) A unit of length equivalent to 69.04677 miles.
(2) A unit of plane angle equivalent to π/180 radians, approximately 1.745329x10-2 radians. The (plane angle) degree is not an SI unit but its use is valid unit within the International System of units.
- deka
-
A measurement unit prefix equivalent to 101.
Symbol: da.
- displacement ton
-
A unit of volume equivalent to 35 cubic feet.
- dram
-
It is a unit of volume equivalent to 0.125 liquid ounces.
- E
-
(1) A symbol for the measurement unit prefix exa.
- english ell
-
A unit of length defined as 45 inches and equivalent to 1.143 meters.
- exa
-
A measurement unit prefix equivalent to 1018.
Symbol: D.
- f
-
(1) A symbol for the measurement unit prefix femto.
- fathom
-
A unit of length equivalent to exactly 6 feet or 1.8288 meters.
- feet per hour
-
A unit of velocity equivalent to 8.466667x10-5 meters per second.
Symbol: ft/h.
- feet per minute
-
A unit of velocity equivalent to 5.08x10-3 meters per second.
Symbol: ft/min.
- feet per second
-
A unit of velocity equivalent to 0.3048 meters per second.
Symbol: ft/s.
- femto
-
A measurement unit prefix equivalent to 10-15.
Symbol: f.
- femtometer
-
A synonym for the measurement unit fermi.
- fermi
-
A unit of length defined as exactly 1x10-15 meters.
Symbol: fm.
Synonym: femtometer.
- finger
-
A unit of length defined as 4.5 inches and equivalent to 1.143x10-1 meters.
- flemish ell
-
A unit of length equivalent to 27 inches.
- fl oz
-
A symbol for fluid ounce.
- fm
-
A symbol for fermi.
- foot
-
A unit of length equivalent to 12 inches and defined as exactly 3.048x10-1 meters.
Symbol: ft.
- ft
-
A symbol for foot.
- ft2
-
A symbol for square foot.
- ft3
-
A symbol for cubic foot.
Symbol: ft3.
- ft/h
-
A symbol for feet per hour.
- ft/min
-
A symbol for feet per minute.
- ft/s
-
A symbol for feet per second.
- furlong
-
A unit of length equivalent to 220 yards.
- G
-
(1) A symbol for the measurement unit prefix giga.
(2) A symbol for the measurement unit gauss.
- gal
-
A symbol for gallon.
- gallon
-
A unit of volume defined as exactly 4.54609x10-3 cubic meters.
Symbol: gal.
- giga
-
A measurement unit prefix equivalent to 109.
Symbol: G.
- gill
-
A unit of volume equivalent to 1.182941x10-4 cubic meters.
- h
-
(1) A symbol for the measurement unit prefix hecto.
(2) A symbol for the measurement unit hour, a unit of time.
- ha
-
A symbol for the measurement unit hectare.
- hairsbreadth
-
A unit of length equivalent to 5.29x10-4 meters.
- hand
-
A unit of length equivalent to 4 inches.
- handsbreadth
-
A unit of length equivalent to 3 inches.
- hank
-
(1) For cotton it is a unit of length equivalent to 560 yards.
(2) For wool it is a unit of length equivalent to 840 yards.
- hectare
-
A unit of area defined as exactly 1x104 square meters.
Symbol: ha.
- hecto
-
A measurement unit prefix equivalent to 102.
Symbol: h.
- heer
-
A unit of length equivalent to 600 yards.
- hogshead
-
A unit of volume equivalent to 63 gallons.
- hour
-
A unit of time defined as exactly 3600 seconds, and as exactly 60 minutes.
Symbol: h; hr.
- hr
-
A symbol for hour.
- in
-
A symbol for inch.
- in2
-
A symbol for square inch.
- in3
-
A symbol for cubic inch.
- inch
-
A unit of length defined as exactly 2.54x10-2 meters, 2.54 centimeters.
Symbol: in.
- inches per second
-
A unit of velocity defined as exactly 2.54x10-2 meters per second.
Symbol: in/s.
- in/s
-
A symbol for inches per second.
- iron
-
A unit of length equivalent to 0.020833 inches.
- k
-
A symbol for the measurement unit prefix kilo.
- kilo
-
A measurement unit prefix equivalent to 103.
Symbol: k.
- keel
-
A unit of volume equivalent to 350 cubic feet.
- kilometers per hour
-
A unit of velocity 2.777778x10-1 meters per second.
Symbol: kph.
- km/h
-
A symbol for kilometers per hour.
- knot
-
A unit of velocity defined exactly as 1 nautical mile per hour and equivalent to 5.14444x10-1 meters per second.
Synonym: nautical miles per hour.
- kph
-
A symbol for kilometers per hour.
- lea
-
A unit of length equivalent to 360 feet.
- league
-
A unit of length equivalent to 3 nautical miles.
- light year
-
A unit of length equivalent to 9.46073x1015 meters.
- line
-
A unit of length defined as 0.025 inches and equivalent to 2.11667 meters.
- link
-
A unit of length equivalent to 7.92 inches.
- liter
-
A unit of volume defined as exactly 1x10-3 cubic meters. The liter is not an SI unit but its use is valid unit within the International System of units.
Symbol: L.
- load
-
For shipping it is a unit of volume equivalent to 800 cubic feet.
- m
-
(1) A symbol for the measurement unit prefix milli.
(2) A symbol for the measurement unit meter, a unit of length.
(3) A symbol for the measurement unit minute, a unit of time.
(4) A symbol for the measurement unit molal, a unit of chemical concentration.
- M
-
(1) A symbol for the measurement unit prefix mega.
(2) A symbol for the measurement unit Mach, a unit of velocity.
(3) A symbol for the measurement unit molar, a unit of chemical concentration.
- m2
-
A symbol for square meter.
- m3
-
A symbol for cubic meter.
- marine league
-
A unit of length equivalent to 3 nautical miles.
- Mark Twain
-
A unit of length equivalent to 2 fathoms.
- mb
-
A symbol for millibarn.
- mega
-
A measurement unit prefix equivalent to 106.
Symbol: M.
- meter
-
The SI standard unit of length.
Symbol: m.
- meters per second
-
The SI standard unit for velocity.
Symbol: m/s; mps.
- mi
-
A symbol for mile.
- mi2
-
Symbol for the measurement unit square mile.
- mi3
-
A symbol for cubic mile.
- micro
-
A measurement unit prefix equivalent to 10-6.
Symbol: µ.
- microinch
-
A unit of length defined as exactly 2.54x10-8 meters.
- micron
-
A unit of length defined as exactly 1x10-6 meters.
Symbol: µ.
- mi/h
-
A symbol for miles per hour.
- mil
-
(1) A unit of length equivalent to 0.001 inches and defined as exactly 2.54x10-5 meters.
(2) A unit of plane angle equivalent to 9.817447x10-4 radians.
- mile
-
A unit of length equivalent to 5,280 feet and 1.609344x103 meters.
- miles per hour
-
A unit of velocity defined as exactly 4.4704x10-1 meters per second, and as exactly 1.609344 km/h.
Symbols: mi/h; mph.
- miles per minute
-
A unit of velocity defined as exactly 2.68224x101 meters per minute.
Symbol: mi/min.
- miles per second
-
A unit of velocity defined as exactly 1.609344x103 meters per second.
Symbol: mi/s.
- milli
-
A measurement unit prefix equivalent to 10-3.
Symbol: m.
- millibarn
-
A unit of reaction probability which is expressed as an area and is equivalent to 10-3 barn.
Symbol: mb.
- mi/min
-
A symbol for miles per minute.
- min
-
A symbol for min.
- minute
-
A unit of time defined as exactly 60 seconds.
Symbol: min.
- mi/s
-
A symbol for miles per second.
- mo
-
A symbol for month.
- month
-
A unit of time equivalent to 2.628x106 seconds.
Symbol: mo.
- mph
-
A symbol for miles per hour.
- mps
-
A symbol for meters per second.
- m/s
-
A symbol for meters per second.
- nail
-
A unit of length defined as one half finger and equivalent to 2.25 inches.
- mutchkin
-
A unit of volume equivalent to 3 imperial gills.
- nano
-
A measurement unit prefix equivalent to 10-9.
Symbol: n.
- nautical mile
-
A unit of length equivalent to 1,852 meters.
- nautical miles per hour
-
A synonym for knot.
- ounce
-
A unit of volume equivalent to 2.957353x10-5 cubic meters.
- p
-
A symbol for the measurement unit prefix pico.
- P
-
(1) A symbol for the measurement unit prefix peta.
(2) A symbol for the measurement unit poise, a unit of viscosity.
- Pa
-
A symbol for the measurement unit pascal, a unit of pressure.
- palm
-
-
A synonym for the measurement unit handsbreadth.
- parsec
-
A unit of length equivalent to 3.085678x1016 meters.
- peck
-
A unit of volume equivalent to 8.809768x10-3 cubic meters.
- perch
-
(1) A synonym for the measurement unit rod.
(2) A unit of volume equivalent to 24.75 cubic feet.
- peta
-
A measurement unit prefix equivalent to 1015.
Symbol: P.
- pica
-
A unit of length defined as 1/6 inch and equivalent to 4.2333x10-3 meters.
- pico
-
A measurement unit prefix equivalent to 10-12.
Symbol: p.
- pin
-
A unit of volume equivalent to 4.5 imperial gallons.
- point
-
(1) A unit of length defined as 1/72 inches and equivalent to 3.514598x10-4 meters.
(2) A unit of mass defined as 2 milligrams inches and equivalent to 2.x10-3 grams.
- pole
-
A synonym for the measurement unit rod.
- qt
-
A symbol for the measurement unit quart.
- quarter
-
(1) A synonym for the measurement unit span.
(2) A unit of mass defined as 5 blocks and equivalent to 5.x10-2 grams.
- quarteron
-
A unit of area defined as 1.76 square meters.
- rd
-
Symbol for the measurement unit rod.
- reed
-
A unit of length defined as 108 inches and equivalent to 2.7432 meters.
- rod
-
A unit of length equivalent to 5.029210 meters.
Symbol: rd.
Synonyms: perch; pole.
- roll
-
For wall paper, it is a unit of area defined as 30 square feet and equivalent to 2.787 square meters.
- rope
-
A unit of length defined as 20 feet.
- s
-
A symbol for second.
- scottish ell
-
A unit of length defined as 37 inches.
- scruple
-
A unit of volume equivalent to 6.48524x10-2 milliliters.
- seam
-
A unit of volume equivalent to 8 bushels.
- sec
-
A symbol for second.
- second
-
The SI standard unit of time.
Symbol: s; sec.
- shaftment
-
A unit of length defined as 6 inches.
Synonym: shathmont.
- shathmont
-
A synonym for the measurement unit shaftment.
- shake
-
A unit of time defined as exactly 1x10-8 seconds.
- shipload
-
For shipping it is a unit of volume defined as exactly 7,000 cubic feet.
- siegbohn
-
A unit of length defined as 1x10-13 meters.
- silversmith’s point
-
A unit of length defined as 0.00025 inches and equivalent to 6.35x10-6 meters.
- skein
-
A unit of length defined as 360 feet and equivalent to 1.09728x102 meters.
- span
-
A unit of length defined as 9 inches and equivalent to 2.286x10-1 meters.
Synonym: quarter.
- speed of light
-
A synonym for speed of light in a vacuum.
- speed of light in a vacuum
-
The distance that light travels in a vacuum per unit time. It has a value (1998 CODATA) of exactly 2.99792458x108 meters per second.
Symbols: c; c0.
- speed of sound
-
The speed at which sound travels in a given medium under specified conditions. The speed of sound at sea level in the International Standard Atmosphere is 1108 feet per second or 1215 kilometers per hour.
- square foot
-
A unit of area defined as 144 square inches and equivalent to 9.290304x10-2 square meters.
Symbol: ft2.
- square inch
-
A unit of area defined as exactly 6.4516x10-4 square meters.
Symbol: in2.
- square meter
-
The SI standard unit of area.
Symbol: m2.
- square mile
-
A unit of area defined as 640 acres and equivalent to 2.589988x106 square meters.
Symbol: mi2.
- square pes
-
A unit of area equivalent to 8.74126-2 square meters.
- square Scottish ell
-
A unit of area equivalent to 8.8322x10-1 square meters.
- square vara
-
A unit of area equivalent to 7.16883x10-1 square meters.
- square yard
-
A unit of area defined as 1,296 square inches and equivalent to 8.361274x10-1 square meters.
Symbol: yd2.
- st
-
A symbol for the measurement unit stere.
- stack
-
A unit of volume equivalent to 108 cubic feet.
- stadian
-
A synonym for stadium.
- stadium
-
A unit of length defined as 606 feet and equivalent to 1.847088x102 meters.
Synonym: stadion.
- standard
-
A unit of volume equivalent to 200 board feet.
- statute mile
-
A unit of length defined as 5280 feet and equivalent to 1.609344x103 meters.
- stere
-
A unit of volume defined as exactly 1 cubic meter.
- strike
-
A unit of volume defined as exactly 8 pecks.
- T
-
(1) A symbol for the measurement unit prefix tera.
(2) A symbol for the measurement unit tesla, a unit of magnetic flux density.
- tablespoon
-
A unit of volume equivalent to 3 teaspoons and equivalent to 1.479x10-5 cubic meters.
Symbol: Tbs.
- tank
-
A unit of volume equivalent to 400 imperial gallons.
- Tbs
-
A symbol for the measurement unit tablespoon.
- teaspoon
-
A unit of volume equivalent to 4.929x10-6 cubic meters.
Symbol: tsp.
- tera
-
A measurement unit prefix equivalent to 1012.
Symbol: T.
- thread
-
A unit of length defined as 54 inches and equivalent to 1.3716 meters.
- timber load
-
A unit of volume equivalent ot 50 cubic feet.
- tsp
-
A symbol for the measurement unit teaspoon.
- v
-
A symbol for velocity.
- vara
-
A unit of length equivalent to 33.333 inches and equivalent to 8.46658x10-1 meters.
- velocity
-
A measurement unit derived from the base units length and time, and expressed as length divided by time.
Symbol: v.
- vol
-
A symbol for the class of measurement unit volume.
- volume
-
A class of measurement unit that is derived by multiplying three units of length.
Symbol: vol.
- week
-
A unit of time equivalent to 604800.0 seconds.
Symbol: wk.
- wey
-
A unit of volume equivalent to 40 British bushels.
- windle
-
A unit of volume equivalent to 3.5 bushels.
- wk
-
A symbol for week.
- wrap
-
A unit of length defined as 240 feet and equivalent to 7.3152x101 meters.
- y
-
A symbol for the measurement unit prefix yocto.
- Y
-
A symbol for the measurement unit prefix yotta.
- yard
-
(1) A unit of length equivalent to 3 feet and defined as exactly 9.144x10-1 meters.
(2) A unit of volume defined as 5 pints.
- yd
-
Symbol for the measurement unit yard.
- yd2
-
Symbol for the measurement unit square yard.
- yd3
-
A symbol for cubic yard.
- year
-
A unit of time defined as exactly 3.1536x107 seconds.
Symbol: yr.
- yocto
-
A measurement unit prefix equivalent to 10-24.
Symbol: y.
- yotta
-
A measurement unit prefix equivalent to 1024.
Symbol: Y.
- yr
-
A symbol for year.
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