Abstract
Utility of a perturbed hard sphere equation of state based on a simplified Barker-Henderson theory for a square well fluid inclusive of the three-body contributions is examined for orthobaric densities and both sub- and supercritical isotherms of simple fluids. An attempt is made to interpret parameters of the equation and their temperature dependence in terms of independent molecular properties. Finally, some general conclusions on the family of perturbed hard sphere equations of state are drawn.
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