Berthelot equation of state

$RT=\left(p+{\frac {a}{Tv^{2}}}\right)\left(v-b\right)$

where

$a={\frac {27}{64}}R^{2}{\frac {T_{c}^{3}}{P_{c}}}$

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 b=\frac{RT_c}{8P_c}}

References

1. D. J. Berthelot "", J. Phys., 8 pp. 263- (1899)