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1 kg m 2 s −2
A joule is also the energy supplied by a power of 1 watt for one second.
Conversions
Other energy units can be expressed in joules :
the calorie : 1 cal = 4.185 5 joules ;
the therm 1 therm = 4 185 500 joules. the therm is worth 1 million calories ;
the kilowatt hour 1 kWh = 3 600 000 J. The kilowatt hour is the energy supplied by a power of one kilowatt for one hour ;
The watt second : 1 Ws = 1 joule.
The kilogrammeter : 1 kilogrammeter = 9.806 65 joules
One joule is exactly :
10 7 ergs ;
1 pascal - cubic meter.
One joule is approximately equal to :
6.241 506 363 09 × 10 18 eV ( electronvolts ) ;
9.869 2 × 10 −3 liter- atmosphere .
Summary
1 calorie
= 4.185 5 J
1 joule
= 0.238 9 calories
1 therm
= 4.185 5 MJ
1 joule
= 2.389 × 10 −7 therm
1 kWh
= 3 600 000 J
1 joule
= 2.778 × 10 −7 kWh
1 Ws
= 1 J
1 joule
= 1 Ws
1 erg
= 10 −7 J
1 joule
= 10 7 ergs
1 Pa m 3
= 1 J
1 joule
= 1 Pa m 3
1 eV
= 1.602 177 33 × 10 −19 J
1 joule
= 6,241 506 363 09 × 10 18 eV
Multiples and submultiples
In practice, only multiples and submultiples of a thousand to thousand are used (prefixes milli , micro , nano , etc. for submultiples, kilo , mega , giga , etc. for multiples).
Submultiples
millijoule : 1 mJ = 10 −3 J
microjoule : 1 µJ = 10 −6 J
nanojoule : 1 nJ = 10 −9 J
Multiple |
kilojoule : 1 kJ = 10 3 J
megajoule : 1 MJ = 10 6 J
gigajoule : 1 GJ = 10 9 J
terajoule : 1 TJ = 10 12 J
petajoule : 1 PJ = 10 15 J
exajoule : 1 EJ = 10 18 J
Terajoule, petajoule and exajoule are often used in brochures relating to national or global energy consumption :
1 TJ = 0.277 8 GWh
1 PJ = 0.277 8 TWh
1 EJ = 0.277 8 PWh = 277.8 TWh = 0.947 PBtu (or quadrillion Btu ) = 23.884 Mtep
In everyday life
In everyday life and approximately :
1 joule :
the energy required to lift an object weighing 100 grams by one meter in the earth's gravity field ;
the energy required to raise the temperature of one gram (one liter) of dry air by one degree Celsius .
4.18 joules :
the energy required to raise the temperature of one gram of water by 1 ° C.
1 000 joules :
the amount of heat given off in ten seconds by a person at rest ;
the energy needed for a 30 kg child to climb 3.40 m
the energy consumed by a Google query 5 .
1 megajoule (one million joules) :
16.7 minutes of heating by a 1000 W heater .
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