Wohl equation of state

The Wohl equation of state is given by

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

where

$\left.a\right.=6P_{c}T_{c}v_{c}^{2}$

$b={\frac {v_{c}}{4}}$

and

$\left.c\right.=4P_{c}T_{c}^{2}v_{c}^{3}$

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.