Henri Regnault, French chemist

Henri Regnault, French chemist

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Credit: COLLECTION ABECASIS/SCIENCE PHOTO LIBRARY

Caption: Henri Regnault (1810-1878). 1882 illustration of the French physicist and chemist Henri Victor Regnault. Regnault is best known for his careful measurements of the thermal properties of gases. He succeeded Gay-Lussac as professor of chemistry at the Ecole Polytechnique in Paris. He studied aliphatic chloro-compounds and discovered vinyl chloride and other industrially important materials. He published a chemistry treatise in 1847. In physics, Regnault improved techniques for determining the specific heats of solids, liquids, and devised a method for gases. He was able to show how real gases deviate from the ideal gas laws and he measured the velocity of sound.

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