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Questions related to a thermodynamic equation describing the state of matter under a given set of physical conditions.

3
votes
The virial equation is set up for the gas phase only. The virial coefficients $B$ and $C$ are found from gas phase measurements. If you get three solutions, I suspect that it is the largest one that …
answered Sep 14 '12 by Paul J. Gans
11
votes
The van der Waals equation can't be derived from first principles. It is an ad-hoc formula. There is a "derivation" in statistical mechanics from a partition function that is engineered to give the …
answered Jul 2 '12 by Paul J. Gans