Lever Rule

Mathematical expression whereby the relative phase amounts in a two-phase alloy at equilibrium may be computed.

In a phase diagram, the relative proportions of the conjugate phases, at a stated value of temperature and pressure, or both, is such that a state of mechanical balance would be obtained, if the corresponding weight of each phase were placed upon its composition point upon the tie-element and the fulcrum were located at the gross composition point of the mixture.

See also: Alloy.

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Subjects: Chemistry