Glossary of Terms

Units of Measurement

Below is a list of the most commonly used units of measure (according to the Imperial system and International System of Units) with their corresponding symbols. They are followed by a table of multiples and sub-multiples of the decimal system.

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

A

ampere A
ampere-hour Ah
ampere-turn Atr
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B

bar bar
British thermal unit Btu
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C

calorie cal
candela cd
centimetre cm
square centimetre cm2
cubic centimetre cm3
centimetre per second cm/s
circular mil CM
one thousand circular mils MCM
coulomb C
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D

decibel dB
decilitre dl
decimetre dm
degree Celsius oC
degree Fahrenheit oF
dyne dyn
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E

electron-volt eV
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F

farad F
foot ft
foot per minute ft/min
foot per second ft/s
cubic foot ft3
cubic foot per minute ft3/min
cubic foot per second ft3/s
square foot ft2
footcandle (see lumens per square foot) fc
foot-pound ft-lb
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G

gallon gal
Imperial gallon UK gal
United States gallon US gal
gigahertz GHz
gigajoule GJ
gigawatt GW
gram g
gram per square centimetre g/cm2
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H

hertz Hz
horsepower hp
metric horsepower
hour h
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I

inch in
cubic inch in3
square inch in2
inch-pound in-lb
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J

joule J
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K

kelvin K
kilogram kg
kilogram per centimetre kg/cm
kilohertz kHz
kilojoule kJ
kilolitre kl
kilometre km
kilometre per hour km/h
kilopascal kPa
kilopound klb
kilopound per square inch klb/in2
kilopound-inch klb-in
kilovar kvar
kilovolt kV
kilovoltampere kVA
kilowatt kW
kilowatthour kWh

L

litre l
litre per minute l/min
litre per second l/s
lumen lm
lumen per square foot lm/ft2
lux lx
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M

megahertz MHz
megajoule MJ
megavar Mvar
megawatt MW
megohm MΩ
metre m
cubic metre m3
square metre m2
metre per minute m/min
metre per second m/s
metric horsepower
microampere µA
micrometre (micron) µm
mil mil
circular mil CM
thousands circular mill MCM
mile mi
square mille mi2
mile per hour mi/h
mill mill
milliampere mA
milligram mg
millilitre ml
millimetre mm
cubic millimetre mm3
square millimetre mm2
minute (angle) '
minute (time) min
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N

newton N
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O

ohm
ounce oz
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P

pascal Pa
pint
pound lb
pound per square foot lb/ft2
pound per cubic foot lb/ft3
pound per square inch lb/in2
pound-foot (see foot-pound)
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R

radian rad
radian per second rad/s
revolutions per minute RPM
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S

second (angle) "
seconde (time) s
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T

terawatt TW
metric ton MT
short ton ST
statute ton
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U

British thermal unit BTU
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V

var var
volt V
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W

watt W
watthour Wh
week wk
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Y

yard yd
cubic yard yd3
square yard yd2
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Multiples and sub-multiples of the decimal system

The prefixes below are used to express the multiples commonly used—kilowatthours (kWh), megawatts (MW), kilovolts (kV), etc.—when we talk about the generation, transmission, distribution or consumption of electricity:

  Prefix Symbol
10 = 101 deca da
100 = 102 hecto h
1,000 = 103 kilo k
1,000,000 = 106 mega M
1,000,000,000 = 109 giga G
1,000,000,000,000 = 1012 tera T
1,000,000,000,000,000 = 1015 peta P
1,000,000,000,000,000,000 = 1018 exa E
0.1 = 10-1 deci d
0.01 = 10-2 centi c
0.001 = 10-3 milli m
0.000 001 = 10-6 micro µ
0.000 000 001 = 10-9 nano n
0.000 000 000 001 = 10-12 pico p
0.000 000 000 000 001 = 10-15 femto f
0.000 000 000 000 000 001 = 10-18 atto a
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