fugacity

fu·ga·cious

F0351700 (fyo͞o-gā′shəs)adj.1. Passing away quickly; evanescent.2. Botany Withering or dropping off early.

[From Latin fugāx, fugāc-, from fugere, to flee.]

fu·ga′cious·ly adv.fu·gac′i·ty (-găs′ĭ-tē) n.

fugacity

(fjuːˈɡæsɪtɪ) n1. (General Physics) thermodynamics Also called: escaping tendency a property of a gas, related to its partial pressure, that expresses its tendency to escape or expand, given by d(logef) = dμ/RT, where μ is the chemical potential, R the gas constant, and T the thermodynamic temperature. Symbol: f 2. (Botany) the state or quality of being fugacious

fugacity

the condition of being fugacious or transitory; evanescence. — fugacious, adj.See also: Decaying

Thesaurus

Noun	1.	fugacity - the tendency of a gas to expand or escapephysical property - any property used to characterize matter and energy and their interactions
	2.	fugacity - the lack of enduring qualities (used chiefly of plant parts)fugaciousnessplant life, flora, plant - (botany) a living organism lacking the power of locomotiontransience, transiency, transitoriness - an impermanence that suggests the inevitability of ending or dying

Fugacity

fugacity

[fyü′gas·əd·ē] (thermodynamics) A function used as an analog of the partial pressure in applying thermodynamics to real systems; at a constant temperature it is proportional to the exponential of the ratio of the chemical potential of a constituent of a system divided by the product of the gas constant and the temperature, and it approaches the partial pressure as the total pressure of the gas approaches zero.

Fugacity

a quantity used to calculate the properties of real gases by means of the thermodynamic relationships developed for ideal gases (seeGASES). The concept of fugacity was introduced by G. Lewis in 1901.

The fugacity f of a given gas or a given component of a gas mixture is a function of pressure p and temperature T and of the concentration of each component of a mixture. When the fugacity is substituted for the partial pressure in the thermodynamic equations for an ideal gas, the equations are rendered valid for a real gas under the conditions considered. Although this technique is a formal mathematical procedure, it is productive because the use of more complex equations of state for real gases entails substantial computational difficulties and may not provide the necessary accuracy, since any equation of state for a real gas is valid only within a specific range of values of p and T.

The ratio flp is called the fugacity coefficient; for an ideal gas, it is obviously equal to unity under any conditions. Thus, the difference between the value of flp and unity characterizes the extent to which a gas departs from the ideal state. The role of the fugacity of a gas with respect to the partial pressure of the gas is similar to the role of the activity of a component of a solution with respect to the concentration of the component.

Since the fugacity of a substance that forms or is a constituent of a condensed phase is equal to the fugacity of the substance in the saturated vapor of the phase, the fugacity may also be regarded as a value that quantitatively characterizes—for a given p, T, and phase composition—the ability of the substance to leave the phase.

REFERENCES

See references under THERMODYNAMICS, CHEMICAL.

M. KH. KARAPET’IANTS

fugacity

fu·gac·i·ty (f),

(fū-gas'i-tē), The tendency of the molecules in a fluid, as a result of all forces acting on them, to leave a given site in the body; the escaping tendency of a fluid, as in diffusion, evaporation, etc. [L. fuga, flight]

fu·gac·i·ty

(f) (fyū-gas'i-tē) The tendency of the molecules in a fluid, as a result of all forces acting on them, to leave a given site in the body; the escaping tendency of a fluid, as in diffusion, evaporation, and the like. [L. fuga, flight]

fugacity

fu·ga·cious

fugacity

fugacity

Fugacity

fugacity

Fugacity

REFERENCES

fugacity

fu·gac·i·ty (f),

fu·gac·i·ty

fugacity

Synonyms for fugacity

noun the tendency of a gas to expand or escape

Related Words

noun the lack of enduring qualities (used chiefly of plant parts)

Synonyms

Related Words