DERIVATION OF A THERMODYNAMIC CLOSURE RELATION IN THE ISOTHERMAL-ISOBARIC ENSEMBLE USING QUASI-GAUSSIAN ENTROPY THEORY

In an analogous way as was done previously in the canonical ensemble, we derived for dilute gases an approximated thermodynamic closure rela tion in the isothermal-isobaric ensemble using quasi-Gaussian entropy theory. For the Gamma state, we formulated equations for the temperatu re dependence of various thermodynamic properties at constant pressure . The theory was applied to gaseous water and methane at 1 and IO bar respectively, and gave for both systems an accurate prediction of the entropy and heat capacity over a large temperature interval.