Pierre Louis Dulong

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The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Dulong, Pierre Louis


Born Feb. 12, 1785, in Rouen; died July 19, 1838, in Paris. French physicist and chemist. Member of the Paris Academy of Sciences (1823).

Dulong was a physician by training and a professor of chemistry at the Paris Veterinary School. Beginning in 1820 he was a professor of physics at the Polytechnic School in Paris. He was the first to obtain nitrogen chloride (1811) and hypophosphorous acid (1816). In 1815, almost simultaneously with H. Davy, he proposed the hydrogen theory of acids. In 1819, together with A. Petit, he established the law of specific heat in solids (Dulong and Petit’s law); they also derived a general formula for the cooling rate of substances and invented the cathetometer. Between 1824 and 1830 Dulong, together with D. F. Arago, determined the pressure of saturated steam at different temperatures (up to 224°C).


Recherches sur la mesure des temperatures et sur les his de la communication de la chaleur. Paris, 1818. (With A. T. Petit.)
The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.