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A joule is the amount of work done when a force of one Newton is applied through a distance of one meter.
1 Joule = 1 Newton-meter = 1 kg-m2/s2
1 Joule = 1*107 erg = 0.7376 ft-lb = 0.2389 cal = 6.242*1018 eV

Joule is a SI unit is named after James Prescott Joule. As with every International System of Units (SI) unit whose name is derived from the proper name of a person, the first letter of its symbol is upper case (J). However, when an SI unit is spelled out in English, it should always begin with a lower case letter (joule), except in a situation where any word in that position would be capitalized, such as at the beginning of a sentence or in capitalized material such as a title. Note that "degree Celsius" conforms to this rule because the "d" is lowercase.

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