 #1
CGandC
 285
 24
 Homework Statement:
 I was wondering how is it proved that Van Der Waals Gas is a secondorder phase transition.
 Relevant Equations:

Van Der Waals gas's pressure is: $$ P = \frac{NRT}{VNb}  \frac{aN^2}{V^2} $$
( This equation does not exist for V<=NB )
How is it proved that Van Der Waals gas is a second order phase transition?
The second order derivative of the pressure (P ) with respect to volume ( V ) don't have a discontinuity ( except at point V = Nb , but the pressure is not existent for V<=Nb ). So how come Van der waals gas describes a second order phase transition?
The second order derivative of the pressure (P ) with respect to volume ( V ) don't have a discontinuity ( except at point V = Nb , but the pressure is not existent for V<=Nb ). So how come Van der waals gas describes a second order phase transition?