Redlich-Kwong equation of state

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

where

$a= 0.4278 \frac{R^2T_c^{2.5}}{P_c}$

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. $T c$ is the critical temperature and $P c$ is the pressure at the critical point.

[edit] References

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)
Giorgio Soave "Equilibrium constants from a modified Redlich-Kwong equation of state", Chemical Engineering Science 27 pp. 1197-1203 (1972)

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Category: Equations of state

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