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Massieu Function

The Massieu function, $\Psi$, is defined as: $\Psi = \Psi (X_1, \dots , X_i, Y_{i+1}, \dots , Y_r )$, where for every system with degree of freedom $r$ one may choose $r$ variables, e.g. , to define a coordinate system, where $X$ and $Y$ are extensive and intensive variables, respectively, and where at least one extensive variable must be within this set in order to define the size of the system. The $(r + 1)^{th}$ variable,$\Psi$ , is then called the Massieu function.

http://en.wikipedia.org/wiki/Massieu_function

http://www.iso.org/iso/catalogue_detail?csnumber=31890

$J = -A/T$, where $A$ is Helmholtz energy and $T$ is thermodynamic temperature.

J