Dulong and Petit's law

Dulong and Petit's law
Du·long and Pe·tit's law 'd(y)ü-.lȯŋ-ən-pə-'tēz-, d(y)ü-' n a law in physics and chemistry: the specific heats of most solid elements multiplied by their atomic weights are nearly the same averaging a little over six calories per degree Celsius per gram-atomic weight
Du·long due-lōn Pierre-Louis (1785-1838), and
Pe·tit p(ə-)tē Alexis-Thérèse (1791-1820)
French physicists. Dulong and Petit collaborated on important studies of temperature measurement and heat transfer. In 1815 they made the first accurate comparison between air and mercury thermometers. Two years later they showed that Newton's law of cooling is true only for small differences in temperature. In 1819 they demonstrated that the heat produced in the compression of a gas is proportional to the work done. In that same year they formulated the law concerning specific heats that now bears their names.

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the atomic heat capacity, the product of the atomic weight and the specific heat per gram, is constant for most elements; boron, carbon, and silicon are notable exceptions at normal temperatures.

Medical dictionary. 2011.

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  • dulong and petit's law — |d(y)üˌl]ȯŋənpəˈtēz , d(y)ü|l] noun Usage: usually capitalized D&P Etymology: after Pierre L. Dulong died 1838 and Alexis T. Petit died 1820 French physicists : a law in physics and chemistry: the atomic heats of most solid elements are nearly… …   Useful english dictionary

  • law of dulong and petit — Usage: usually capitalized D&P : dulong and petit s law …   Useful english dictionary

  • Petit's law — Pe·tit s law (pə tēzґ) [Alexis Therese Petit, French physicist, 1791–1820] Dulong and Petit s law; see under law …   Medical dictionary

  • Petit's law — Dulong and Petit s l …   Medical dictionary

  • Petit , Alexis-Thérèse — (1791–1820) French physicist Petit, who was born at Vesoul in France, entered the Ecole Polytechnique in 1807. He spent a period teaching physics in Paris, and received a doctorate in 1811. He was one of the professors of physics at the Ecole… …   Scientists

  • Dulong–Petit law — The Dulong–Petit law, a chemical law proposed in 1819 by French physicists Pierre Louis Dulong and Alexis Thérèse Petit, states the classical expression for the molar specific heat capacity of a crystal. Experimentally the two scientists had… …   Wikipedia

  • Pierre Louis Dulong — (February 12, 1785 ndash; July 19, 1838) was a French physicist and chemist, remembered today largely for the law of Dulong and Petit. Life and work Dulong was born in Rouen, France. He worked on the specific heat capacity and the expansion and… …   Wikipedia

  • Pierre Louis Dulong — (* 12. Februar 1785 in Rouen; † 19. Juli 1838 in Paris) war ein französischer Mediziner, Physiker und Chemiker. Inhaltsver …   Deutsch Wikipedia

  • Dulong–Petit law — ▪ science       statement that the gram atomic heat capacity (specific heat times atomic weight) of an element is a constant; that is, it is the same for all solid elements, about six calories per gram atom. The law was formulated (1819) on the… …   Universalium

  • Dulong-Petit law — n. chemical law that states that specific heat capacity of many solid elements are contrarily proportional to their atomic weights (law formulated in 1819 by Pierre Louis Dulong and Alexis Petit) …   English contemporary dictionary

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