The done or energy required to exert a force of one newton for a distance of one metre, so the same quantity may be referred to as a newton metre or newton-metre with the symbol N·m. However, the newton metre is usually used as a measure of work.

Definition[επεξεργασία | επεξεργασία κώδικα]

As a rough guide, 1 joule is the absolute minimum amount of energy required to lift a one kilogram object up by a height of 10 centimetres on the surface of the Earth.

Other definitions[επεξεργασία | επεξεργασία κώδικα]

One joule is also:

  • The work required to move an electric charge of one coulomb through an electrical potential difference of one volt; or one coulomb volt, with the symbol C·V.
  • The work done to produce power of one watt continuously for one second; or one watt second (compare kilowatt-hour), with the symbol W·s

Conversions[επεξεργασία | επεξεργασία κώδικα]

1 joule is exactly 107 ergs.

1 joule is approximately equal to:

Also, some very rough approximations of a joule from the real world are:

  • the energy required to lift a small apple (102 g) one metre against Earth's gravity.
  • the amount of energy, as heat, that a quiet person produces every hundredth of a second.
  • the energy required to heat one gram of dry, cool air by 1 degree Celsius.
  • 1/100th of the energy a person can get by drinking a single droplet of beer.

Units defined in terms of the joule include:

History[επεξεργασία | επεξεργασία κώδικα]

A joule is the mechanical equivalent of heat meaning the number of units of work in which the unit of heat can perform. Its value was found by Joule James-Prescott in experiments that showed the mechanical energy Joule's equivalent, and represented by the symbol J. The term was first introduced by Dr. Mayer of Heilbronn.

Istography (References)[επεξεργασία | επεξεργασία κώδικα]

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