James Joule
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James Prescott Joule (1818 - 1889) was a brewer who, due to his work studying heat[1], became one of the founders of the science of thermodynamics. He is best known for showing that mechanical work and heat are interchangeable, which he did by carefully measuring the tempearature increase in water stirred by paddle wheels.
The SI Unit of energy, the Joule, is named in his honor.