Lectionary Calendar
Sunday, December 22nd, 2024
the Fourth Week of Advent
the Fourth Week of Advent
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Bible Dictionaries
Phase Rule
Webster's Dictionary
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A generalization with regard to systems of chemical equilibrium, discovered by Prof. J. Willard Gibbs. It may be stated thus: The degree of variableness (number of degrees of freedom) of a system is equal to the number of components minus the number of phases, plus two. Thus, if the components be salt and water, and the phases salt, ice, saturated solution, and vapor, the system is invariant, that is, there is only one set of conditions under which these four phases can exist in equilibrium. If only three phases be considered, the system is univariant, that is, the fixing of one condition, as temperature, determines the others.
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These files are public domain.
Text Courtesy of BibleSupport.com. Used by Permission.
Bibliography Information
Webster, Noah. Entry for 'Phase Rule'. Noah Webster's American Dictionary. https://www.studylight.org/​dictionaries/​eng/​web/​p/phase-rule.html. 1828.
Webster, Noah. Entry for 'Phase Rule'. Noah Webster's American Dictionary. https://www.studylight.org/​dictionaries/​eng/​web/​p/phase-rule.html. 1828.