Redlich-Kwong equation of state

$\left[p+{\frac {a}{T^{1/2}v(v+b)}}\right](v-b)=RT$

where

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

and

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

where $p$ is the pressure, $T$ is the temperature and $R$ is the molar gas constant. Failed to parse (SVG (MathML can be enabled via browser plugin): Invalid response ("Math extension cannot connect to Restbase.") from server "https://wikimedia.org/api/rest_v1/":): {\displaystyle T_c} is the critical temperature and Failed to parse (SVG (MathML can be enabled via browser plugin): Invalid response ("Math extension cannot connect to Restbase.") from server "https://wikimedia.org/api/rest_v1/":): {\displaystyle P_c} is the pressure at the critical point.

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)