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The perturbation theory of simple liquids has recently met with great success. In this paper we present a critical discussion of this theory. The unperturbed system is, as usual, identified with hard spheres whose diameters are determined by a self-consistency requirement. The thermodynamics of the system, including the first-order contribution, can be computed analytically. The equation of state thus obtained is used to discuss experimental results on non-polar liquids.
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Verlet et al. (1972) studied this question.
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