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Energy units
- 1.0 Joule (J) = one Newton applied over a distance of one meter (= 1 kg m2/s2).
- 1.0 Joule = 0.239 calories (cal) = 0.2278∙10-3 Wh = 0.947∙10-3 Btu
- 1.0 Calorie = 4.187 J = 1.167∙10-3 Wh = 3.968∙10-3 Btu
- 1.0 Kilowatt-hour (kWh) = 3.600 J = 3.413 Btu = 859 cal
- 1.0 British thermal unit (Btu) = 1055 joules = 0.2932 Wh = 252 cal
- 1.0 Kilowatt (KW)= 1,000 joule/second = 3.413 Btu/hr = 1.341 horsepower
- 1.0 Horsepower (hp) = 2545 Btu/hour = 745.7 watts
- 1.0 Btu/hr = 293 W = 0.393 ∙10-3 hp
- 1.0 kilograms (kg) = 2.205 pounds
- 1. pound = 0.4536 kg
Volume units
-
1.0 m3 = 1,000 liter = 264.17 US gallon = 219.9 imperial (UK) gallon
-
1.0 liter = 0.001m3 = 0.264 US gallon = 0.220 imperial (UK) gallon
- 1.0 US gallon = 3.79 liter = 3.785 ∙10-3 m3 = 0.833 imperial (UK) gallon
- 1.0 imperial (UK) gallon = 4.546 ∙10-3 m3 = 4.55 liter = 1.20 US gallon
- 1.0 Barrel = 159 lt = 0.159 m3 = 42 US gallons = 34.9 imperial (UK) gallons
yotta
[Y] 1 000 000 000 000 000 000 000 000
= 1024
zetta [Z] 1 000 000 000 000 000 000 000
= 1021
exa [E] 1 000 000 000 000
000 000
= 1018
peta [P] 1 000 000 000 000 000
= 1015
tera [T] 1 000 000 000 000
= 112
giga [G] 1 000 000 000
(a
thousand millions = a billion)
mega [M] 1 000 000
(a million)
kilo [k] 1 000
(a thousand)
hecto [h] 100
(a hundred)
deca [da] 10
(ten)
1
deci [d] 0.1
(a tenth)
centi [c] 0.01
(a hundredth)
milli [m] 0.001
(a thousandth)
micro [µ] 0.000 001
(a millionth)
nano [n] 0.000 000 001
(a thousand millionth)
pico [p] 0.000 000 000 001 = 1012
femto [f] 0.000 000 000 000 001 = 1015
atto [a] 0.000 000 000 000 000 001 =
1018
zepto [z] 0.000 000 000 000 000 000 001 = 1021
yocto [y] 0.000 000 000 000 000 000 000 001 = 1024