Carnahan–Starling repulsion

This is the Carnahan–Starling EOS, a reasonably good equation for hard-sphere fluids. As there is no attractive term, it does not make sense to use this EOS for calculations of vapour pressures. But virial coefficients and some single-phase properties are physically meaningful.

The EOS has its pole at too large densities. If accuracy at high densities is important, the Erpenbeck–Wood EOS should be preferred.

adjustable parameters: 1
For technical reasons this EOS had to be implemented with two parameters, but parameter #1 is always ignored.

[1] N. F. Carnahan and K. E. Starling, J. Chem. Phys. 51 (1969) 635–636.

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