This is a reference equation of the hard-sphere fluid. 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.
adjustable parameters: 1
For technical reasons this EOS had to be implemented with two parameters, but parameter #1 is always ignored.
 J. J. Erpenbeck and W. W. Wood, J. Stat. Phys. 35 (1984) 321–340.
 G. A. Iglesias-Silva, K. R. Hall, Fluid Phase Equilib. 98 (1994) 49–54.*/
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