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Wordswarms From Years Past


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Adjacent Words

phase II
phase II clinical trial
phase III
phase III clinical trial
phase in
phase IV
phase IV clinical trial
phase line
Phase meter
phase microscope
phase modulation
phase of cell division
phase of the moon
Phase of vibration
phase out
phase space
Phase splitter
Phase splitting
phase transition
phase-contrast
phase-contrast microscope
phase-out
PHASEAH, PASEAH
phasedown
Phasel
Phaseless
PHASELIS
Phasemeter
Phaseolus
Phaseolus aconitifolius

Phase rule definitions

Webster's 1913 Dictionary

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.



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