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noun, Physical Chemistry.
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.
Compare (def 4).
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
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 transition, state of matter.


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  • Phases

    [feyz] /feɪz/ noun 1. any of the major appearances or aspects in which a thing of varying modes or conditions manifests itself to the eye or mind. 2. a stage in a process of change or development: Each phase of life brings its own joys. 3. a side, aspect, or point of view: This is […]

  • Phase shift keying

    noun 1. See PSK

  • Phases of matter

    The states in which matter can exist: as a solid, liquid, or gas. When temperature changes, matter can undergo a phase change, shifting from one form to another. Examples of phase changes are melting (changing from a solid to a liquid), freezing (changing from a liquid to a solid), evaporation (changing from a liquid to […]

  • Phase-space

    noun, Physics. 1. a hypothetical space constructed so as to have as many coordinates as are necessary to define the state of a given substance or system.

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