Julius Robert Mayer
Julius Robert Mayer
1814-1878
German physiologist and physicist often credited with the first formulation of the principle of energy conservation, specifically the inter-conversion of electrical and magnetic energy, mechanical energy, and heat. Mayer's interest in the subject apparently began in 1840, when, serving as a ship's surgeon, he observed that the venous blood of sailors in the tropics was a brighter shade of red than in the northern latitudes, indicating less need to generate body heat through the oxidation of food.
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Julius Robert Mayer