Nicolas Léonard Sadi Carnot (1796-1832), French physicist
Marie François Sadi Carnot (1837-1894), president of the third French Republic
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Born Paris, SadiCarnot was the son of the eminent geometer Lazare Nicholas Marguerite Carnot and brother of Hippolyte Carnot.
Perhaps the most important contribution Carnot made to thermodynamics was the process of abstraction of the essential features of the steam engine as it was known in his day into a more general, idealized heat engine.