Main Page | See live article | Alphabetical index Alexis Thérèse Petit (October 2, 1791 - June 21, 1820) was a French physicist. Petit was born in Vesoul, France. He is best known for the Dulong-Petit law for the specific heat capacity of metals, which he co-discovered with Pierre Louis Dulong in 1819. Petit died in Paris, France. This article is from Wikipedia. All text is available under the terms of the GNU Free Documentation License.