
Definition of Phase rule
1. Noun. (physics) the rule which states that the number of degrees of freedom in a system at equilibrium equals the number of components minus the number of phases plus 2 ¹
¹ Source: wiktionary.com
Medical Definition of Phase rule
1. 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. (05 Mar 2000)
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