Critical-point thermodynamics of fluids without hole-particle symmetry

We have examined an infinite class of fluids which exhibit a liquid-vapor critical point, with regard to corrections to thermodynamic scaling of critical phenomena. These ``penetrable-sphere models'' possess an underlying bilateral symmetry in their equivalent binary fluid mixture versions. After postulating a suitable scaling for these mixtures, we show that the transciption to the penetrable-sphere models produces a generalization of the conventional pure-fluid scaled equation of state. Some leading corrections to the scaled form of thermodynamic properties are derived and tabulated. These corrections are presented in a form that makes no explicit reference to their modelistic source, so in fact they may apply to real substances.

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