Abstract

Numerical calculations of the thermodynamic properties of argon were performed using Zwanzig perturbation theory in which the reference radial distribution functions were derived from the Percus–Yevick equation in conjunction with an accurate pair potential (HFD–C). Three-body contributions were approximated by an Axilrod–Teller induced triple dipole potential and the Kirkwood superposition approximation to the triple radial distribution function. Agreement with experimental data is very good over a range of densities up to twice the critical density and to a temperature approaching the critical. Deviation of the model from experiment is evident near the critical point, due to onset of macroscopic fluctuations.

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