Abstract
An analytic equation of state for the hard core Yukawa fluid is presented. This explicit, nonempirical equation of state is based on the inverse temperature expansion of the free energy from the mean-spherical approximation (MSA). This equation of state yields an excellent description of the pressure when compared with simulation results. The critical point properties obtained using this equation of state are almost identical to those obtained from the exact MSA. The vapour-liquid coexistence is also studied; the resulting phase diagram agrees very well with the result from the Gibbs ensemble simulation, except in the vicinity of the critical point.
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