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Topic: How are Van der waals constants determined?  (Read 14316 times)

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Offline Donaldson Tan

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Re:How are Van der waals constants determined?
« Reply #15 on: January 18, 2006, 02:11:49 PM »
the relations come from the VDW equation.

If you plot the experimental data, you will find that the critical point is also point of inflexion (mathematical term).

assuming that the VDW equation is valid, then dP/dT = d2P/dT2 = 0 at the critical point, since the critical point is the point of inflexion.
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