The Statistical Mechanics of Condensing Systems VI. The Treatment of a System of Constant Energy

The equations for the thermodynamic functions of an imperfect gas up to and including the pressure of condensation, are calculated for a one-component system consisting of chemically saturated molecules. The method starts with the calculation of the phase volume available to a system below a given energy. The thermodynamic functions are expressed in terms of integrals over the configuration space of a few molecules, the integrands involving the mutual potentials. The equations derived are formally equivalent to those derived in the previous papers of this series, using the Gibbs method.