Francois Massieu
Encyclopedia
In thermodynamics
Thermodynamics
Thermodynamics is a physical science that studies the effects on material bodies, and on radiation in regions of space, of transfer of heat and of work done on or by the bodies or radiation...

, Francois Jacques Dominique Massieu (1832-1896) was a French engineer noted for his two 1869 characteristic functions, each of which known as a Massieu function
Massieu function
In thermodynamics, Massieu function, symbol \Psi , is defined by the following relation: \Psi = \Psi \big \, where for every system with degree of freedom r one may choose r variables, e.g...

 (the first of which sometimes called free entropy
Free entropy
A thermodynamic free entropy is an entropic thermodynamic potential analogous to the free energy. Also known as a Massieu, Planck, or Massieu-Planck potentials , or free information. In statistical mechanics, free entropies frequently appear as the logarithm of a partition function...

), as cited by American engineer Willard Gibbs in his 1876 On the Equilibrium of Heterogeneous Substances
On the Equilibrium of Heterogeneous Substances
In the history of thermodynamics, On the Equilibrium of Heterogeneous Substances is a 300-page paper written by American mathematical-engineer Willard Gibbs...

.

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