V=RT/p+b P=RT/V-b) wcr R 。-6p=0 dU CrdT=0 dT =0 T2=T1• Vm=RT/p＋b p = RT/(Vm－b) 0 0 0 V V T V V m m V U p dU C dT dV C dT T p dV V T p RT R T p T p T p T T V b V b dU C dT dT         = + = + −                       − = − =  − =       − −   = = = ∴ T2 = T1