quasi-Gaussian Entropy Theory Research Articles

Prediction of the liquid–vapor equilibrium pressure using the quasi-Gaussian entropy theory

We derived a method to evaluate the liquid–vapor equilibrium pressure, with high accuracy over a large range of temperature, using the quasi-Gaussian entropy theory. The final expression that we obtain for the equilibrium pressure as a function of the temperature can be considered as a very accurate approximate solution of the Clausius–Clapeyron equation. The method was applied to water, methanol and mercury, and was compared to two usual approximations of the Clausius–Clapeyron equation.

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 relation in the isothermal-isobaric ensemble using quasi-Gaussian entropy theory. For the Gamma state, we formulated equations for the temperature dependence of various thermodynamic properties at constant pressure. The theory was applied to gaseous water and methane at 1 and 10 bar respectively, and gave for both systems an accurate prediction of the entropy and heat capacity over a large temperature interval.