Phase rule

Phase rule
Phase rule Phase rule (Phys. Chem.) 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. [Webster 1913 Suppl.]

The Collaborative International Dictionary of English. 2000.

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  • Phase rule — Phase rule. См. Правило фаз. (Источник: «Металлы и сплавы. Справочник.» Под редакцией Ю.П. Солнцева; НПО Профессионал , НПО Мир и семья ; Санкт Петербург, 2003 г.) …   Словарь металлургических терминов

  • phase rule — n. Physical Chem. a generalization in the study of equilibriums between two or more phases of a system, stating that the number of degrees of freedom is equal to the number of components minus the number of phases plus the constant 2, or F = C −… …   English World dictionary

  • phase rule — Physical Chem. 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… …   Universalium

  • phase rule — noun : a law in physical chemistry: the number of degrees of freedom of a system in equilibrium is equal to the number of components minus the number of phases plus the constant two (as in the system ice liquid water water vapor consisting of the …   Useful english dictionary

  • phase rule — fazių taisyklė statusas T sritis chemija apibrėžtis Lygtis, siejanti termodinaminėje pusiausvyroje esančios sistemos fazių, laisvės laipsnių ir komponentų skaičius. atitikmenys: angl. Gibbs equation; phase rule rus. правило фаз; уравнение Гиббса… …   Chemijos terminų aiškinamasis žodynas

  • phase rule — fazių taisyklė statusas T sritis fizika atitikmenys: angl. phase rule vok. Phasengesetz, n; Phasenregel, f rus. правило фаз, n pranc. règle des phases, f …   Fizikos terminų žodynas

  • phase rule — fazių taisyklė statusas T sritis Energetika apibrėžtis Heterogeninės sistemos fazių skaičiaus n ir termodinaminių laisvės laipsnių skaičiaus suma, lygi komponentų skaičiaus k ir būsenos parametrų skaičiaus sumai, t.y. n + 1 = k + 2. Fazių… …   Aiškinamasis šiluminės ir branduolinės technikos terminų žodynas

  • phase rule — a heterogeneous chemical system of p coexistent phases and c variable components has c − p + 2 degrees of freedom or variations of phase, i.e., the sum of its coexistent phases and its possible changes of phase exceeds the number of its… …   Medical dictionary

  • phase rule — noun the rule which states that the number of degrees of freedom in a system at equilibrium equals the number of components minus the number of phases plus 2 …   Wiktionary

  • phase rule — Смотри правило фаз …   Энциклопедический словарь по металлургии

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