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James Prescott Joule

James Prescott Joule
James Prescott Joule, English physicist and brewer (d. 1889)

James Prescott Joule was an English physicist, mathematician and brewer, born in Salford, Lancashire. 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 derived unit of energy, the joule, is named after him.

24 December 1818

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Born in the same month (December 1818): Carl Remigius FreseniusCharles III, Prince of MonacoMary Todd Lincoln