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phase rule

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phase rule
n. Physics
A rule stating that the number of degrees of freedom in a material system at equilibrium is equal to the number of components minus the number of phases plus the constant 2. For example, the system of water vapor, liquid water, and solid ice has zero degrees of freedom because the three phases of vapor, liquid, and solid coexist in the one component, water.
phase rule
n
(Chemistry) 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 [4]
phase rule
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. Also called Gibbs phase rule. See also phase transitionstate of matter


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