François Massieu

François Massieu
Born(1832-08-04)4 August 1832
Died5 February 1896(1896-02-05) (aged 63)
Scientific career
FieldsThermodynamics
ThesisSur les intégrales algébriques des problèmes de mécanique (1861)

François Jacques Dominique Massieu (4 August 1832 – 5 February 1896) was a French thermodynamics engineer noted for his two 1869 characteristic functions, each of which known as a Massieu function (the first of which sometimes called free entropy), as cited by American engineer Willard Gibbs in his 1876 On the Equilibrium of Heterogeneous Substances.