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We know from previous lectures :
Is this always true for VdW gas?
Equation for Tc:
Let us measure everything in critical units:
Van der Waals law:
This is same for all van der Waals gases! All PVT data lie on same master curve. This is called law of corresponding states.
Let us determine binodal for van der Waals gas. In coexisting phases or
If , we have , or
It means that dashed areas below are equal!
© 1997 Boris Veytsman and Michael Kotelyanskii