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Henri Victor Regnault[ANrE´ vEktOr´ runyO´] Pronunciation Key, 1810–78, French physicist and chemist. He was professor of chemistry at the Ecole polytechnique, Paris, from 1840 and at the CollEge de France from 1841; he became chief engineer of mines (1847) and director of the porcelain manufactory at SEvres (1854). In chemistry he is known for his work on the halogen and other derivatives of the unsaturated hydrocarbons. In physics he is noted for his careful measurements of the specific heats and expansion coefficients of many gases, liquids, and solids. He showed that Boyle's law is only approximately true for real gases, and he did important research on the operation of steam engines.
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