Wohl equation of state

The Wohl equation of state is given by

$[p+\frac{a}{Tv(v-b)}-\frac{c}{T^2{v}^3}](v-b)=RT$

where

$a=6P_c{T}_c{v}_c^2$

$b=\frac{v_c}{4}$

and

$c=4P_c{T}_c^2{v}_c^3$

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.