Gibbs Phase Rule
				Index
		Gibbs phase rule expresses the degrees of freedom, F, of a multiphase system in terms of the number of phases, P, present, the number of components, C, and two thermodynamic parameters, normally (p, T). This has the form:  F = C - P + 2. In many cases, the pressure is a constant and the Gibbs phase rule for a constant pressure system is: Fp = C - P +1.