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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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