James Prescott Joule
English physicist and brewer (1818–1889)
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Updated 2026-05-29
English physicist who cracked the relationship between heat and mechanical work, laying groundwork for the law of conservation of energy and thermodynamics. The joule—the SI unit of energy—bears his name.
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James Prescott Joule was an English physicist. Joule studied the nature of heat and discovered its relationship to mechanical work. This led to the law of conservation of energy, which in turn led to the development of the first law of thermodynamics. The SI unit of energy, the joule (J), is named after him.
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