See Also: Gibb's phase rule(medicine)
phase rule(medicine)
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Gibb's phase rule (medicine)


Gibb's phase rule -->
phase rule


An expression of the relationships existing between systems in equilibrium: P + V = C + 2, where P is the number of phases, V the variance or degrees of freedom, and C the number of components; it also follows that the variance is, V = C + 2 -P. For H2O at its triple point, V = 1 + 2 -3 = 0, i.e., both temperature and pressure are fixed.

Synonym: Gibb's phase rule.