- #1

CGandC

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- Homework Statement
- I was wondering how is it proved that Van Der Waals Gas is a second-order phase transition.

- Relevant Equations
- Van Der Waals gas's pressure is: $$ P = \frac{NRT}{V-Nb} - \frac{aN^2}{V^2} $$

( 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?