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The joule (J) is the SI unit of energy and work, and is defined as 1 kg m s = 1 N m = 1 W s. It is named in honour of the physicist James Prescott Joule.
The work required to lift a mass of 102 g (e.g. a small apple) for one metre under the earth's gravity is 1 joule.
1 joule is equal to:
- 0.000,000,278 Kilowatt-hours
- 0.239 calories
- 0.000,948 British thermal units
- 0.738 foot pounds force
- 1 Ws (Watt second)
- 1 Nm (Newton metre)
- 23.7 foot poundals
- 10,000,000 ergs
See 1 E0 J for further comparisons.
See also: conversion of units, eV, kWh, TWh