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Archimedes’ principle experiment using a hand balance: an iron piece weights less in water then in air
Any object, wholly or partially immersed in a fluid, is buoyed up by a force equal to the weight of the fluid displaced by the object (Archimedes’ principle).
Nicolas Léonard Sadi Carnot, portrait
Portrait of Nicolas Léonard Sadi Carnot: 19th century French military engineer and physicist, pioneer of thermodynamics and author of the first successful theory of the maximum efficiency of heat engines. His famous cycle has no wheels