Wohl equation of state

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

where

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

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

and

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

References

1. A. Wohl, Zeitschrift fur Physikalische Chemie (Leipzig) 87 pp. 1- (1914) *(check this ref.)