phase' rule"

Physical Chem.
a law that the number of degrees of freedom in a system in equilibrium is equal to two plus the number of components less the number of phases. Thus, a system of ice, melted ice, and water vapor, being one component and three phases, has no degrees of freedom. Cf. variance (def. 4).

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

phaseoutphase space

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