Physical Chemistry Real gases s Selected equations of state Equation Critical constants Perfect gas RT P van der RT 36 e Waals V-b 27b 276R 1/2 Berthelot rt a1 2aR 2(2a 1/2 =v-bm212(3b3 36 3(3bRSelected equations of state Equation Critical constants Perfect gas van der Waals Berthelot Vm RT P = 2 m Vm a V b RT P − − = 2 m TVm a V b RT P − − = 2 27b a 1/ 2 3 3 2 12 1         b aR bR a 27 8 1/ 2 3 2 3 2       bR a 3b 3b Pc Vc Tc Physical Chemistry Real Gases