van der Waals
This is one of the oldest EOS, and probably — after the EOS of the perfect gas — the best known. It is the ancestor of the cubic equations, i.e., the calculation of volumes for given temperature and pressure leads to a cubic equation.
The EOS exhibits all features of “realistic” equations of state, but is only qualitatively correct.
adjustable parameters: 2
For mixture calculations the following mixing theories are available:
 J. D. van der Waals, On the Continuity of the Gaseous and Liquid States, PhD thesis republished by J. S. Rowlinson, Studies in Statistical Mechanics, Vol. XIV, North-Holland, Amsterdam 1988.
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