the principle that in any system in equilibrium the number of degrees of freedom is equal to the number of components less the number of phases plus two
See also degree of freedom, component (sense 4)
phase rule in American English
Physical Chemistry
a generalization in the study of equilibriums between two or more phases of a system, stating that the number ofdegrees of freedom is equal to the number of components minus the number of phasesplus the constant 2, or F = C − P + 2