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Dulong, Pierre Louis
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Dulong, Pierre Louis
French chemist and physicist. In 1819 he formulated, together with physicist Alexis Petit, the Dulong and Petit law, which states that, for many elements solid at room temperature, the product of relative atomic mass and specific heat capacity is approximately constant. He also discovered the explosive nitrogen trichloride in 1811.
Dulong concluded 1829 that, under the same conditions of temperature and pressure, equal volumes of all gases evolve or absorb the same quantity of heat when they are suddenly expanded or compressed to the same fraction of their original volumes. He also deduced that the accompanying temperature changes are inversely proportional to the specific heat capacities of the gases at constant volume.
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