Phase-rule meaning

A generalization in the study of equilibriums between two or more phases of a system, stating that the number of degrees of freedom is equal to the number of components minus the number of phases plus the constant 2, or F = C − P + 2
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A rule used in thermodynamics stating that the number of degrees of freedom in a physical system at equilibrium is equal to the number of chemical components in the system minus the number of phases plus the constant 2.
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(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
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