Gibbs Phase Rule Definition

A rule stating that the number of degrees of freedom in a closed physical system at equilibrium is equal to the number of chemical 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.
American Heritage

Origin of Gibbs Phase Rule

  • After Josiah Willard Gibbs

    From American Heritage Dictionary of the English Language, 5th Edition

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