Redlich-Kwong equation of state

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where

$a=0.4278{\frac {R^{2}T_{c}^{2.5}}{P_{c}}}$

and

$b=0.0867{\frac {RT_{c}}{P_{c}}}$

References

1. Otto Redlich and J. N. S. Kwong "On the Thermodynamics of Solutions. V. An Equation of State. Fugacities of Gaseous Solutions", Chemical Reviews 44 pp. 233 - 244 (1949)
2. Giorgio Soave "Equilibrium constants from a modified Redlich-Kwong equation of state", Chemical Engineering Science 27 pp. 1197-1203 (1972)