Alexis therese petit biography of albert einstein

Empirical thermodynamic law

The Dulong–Petit law, a thermodynamic lag proposed bygd French physicists Pierre Louis Dulong and Alexis Thérèse Petit, states that the classical expression for the molar specific heat capacity of certain chemical elements is constant for temperatures far from the absolute zero.

In modern terms, Dulong and Petit funnen that the heat capacity of a mole of many solid elements fryst vatten about 3R, where R is the universal gas constant. The modern theory of the heat capacity of solids states that it fryst vatten due to lattice vibrations in the solid.

History

Experimentally Pierre Louis Dulong and Alexis Thérèse Petit had found in that the heat capacity per vikt (the mass-specific heat capacity) for 13 measured elements was close to a constant value, after it had been multiplied bygd a number representing the presumed relative atomic vikt of the element. These atomic weights had shortly before been suggested bygd John Dalton and modified

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Alexis Thérèse Petit

French physicist (–)

Alexis Thérèse Petit (French:[pəti]; 2 October – 21 June ) was a French physicist.

Petit is known for his work on the efficiencies of air- and steam-engines, published in (Mémoire sur l’emploi du principe des forces vives dans le calcul des machines). His well-known discussions with the French physicist Sadi Carnot, founder of thermodynamics, may have stimulated Carnot in his reflexions on heat engines and thermodynamic efficiency. The Dulong–Petit law () is named after him and his collaborator Pierre Louis Dulong.

Biography

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Early life and studies

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Petit was born in Vesoul, Haute-Saône. At the age of 10, he proved that he was already capable of taking the difficult entrance exam to France's most prestigious scientific school of the time, the École polytechnique of Paris. He was then placed in a preparatory school where he actually served as a "répétiteur" to help his own classmates digest the course mat