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Wohl equation of state

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The Wohl equation of state is given by[1]

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

where (Eq. 10 in [2]):

\left. a \right.= 6P_cT_cv_c^2
b= \frac{v_c}{4}


\left. c \right. = 4P_cT_c^2v_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.


  1. A. Wohl "Investigation of the condition equation", Zeitschrift für Physikalische Chemie (Leipzig) 87 pp. 1-39 (1914)
  2. K. K. Shah and G. Thodos "A Comparison of Equations of State", Industrial & Engineering Chemistry 57 pp. 30-37 (1965)