Abstract
The normalized density power expansion of the mean potential at contact distance is calculated for seventeen hard repulsive body fluids. It is shown that first coefficients of the virial series strongly decrease with increasing order. Thus only a very few virial coefficients of the mean potential at contact distance are necessary to calculate the compressibility factor within a few percent through the pressure equation for stable fluid densities. A semiempirical equation of state is proposed for hard repulsive body fluids using two shape factors which are simple analytical functions of the second virial coefficient of the compressibility factor and a mean length to breadth ratio.
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