Peng and Robinson equation of state

The Peng and Robinson equation of state is given by (Ref. 1 Eq. 4)

$P={\frac {RT}{v-b}}-{\frac {a(T)}{v(v+b)+b(v-b)}}$

References

1. Ding-Yu Peng and Donald B. Robinson "A New Two-Constant Equation of State", Industrial & Engineering Chemistry Fundamentals 15 pp. 59 - 64 (1976)