Jean Henri Hassenfratz (20 December 1755 – 26 February 1827) was a French chemist, physics professor, mine inspector, and participant in the French Revolution. In 1794, Hassenfratz took part (with Monge) in the creation of the

École Polytechnique École may refer to: * an elementary school in the French educational stages normally followed by secondary education establishments (collège and lycée) * École (river), a tributary of the Seine flowing in région Île-de-France * École, Savoi ...

(first known as ''École centrale des travaux publics''). Hassenfratz became its first professor of physics, a position he held until 1815, when he was succeeded by Alexis Petit (a former child prodigy and Polytechnique alumni who would soon discover the

Dulong–Petit law The Dulong–Petit law, a thermodynamic law proposed by 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 tempe ...

, in 1819).

External links

* Hassenfratz's (1802
"Sur les Ombres colorées,"
''Journal de l'Ecole polytechnique, ou Bulletin du travail fait à cette école, ser. 1, vol. 4,'' p. 272 - 283 - digital facsimile from the

Linda Hall Library The Linda Hall Library is a privately endowed American library of science, engineering and technology located in Kansas City, Missouri, sitting "majestically on a urban arboretum." It is the "largest independently funded public library of scien ...

1755 births 1827 deaths 19th-century French chemists Scientists from Paris 18th-century French chemists École Polytechnique faculty {{France-chemist-stub