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fugacity    
n. 易逃逸,不安定,无常

易逃逸,不安定,无常

fugacity
n 1: the tendency of a gas to expand or escape
2: the lack of enduring qualities (used chiefly of plant parts)
[synonym: {fugacity}, {fugaciousness}]

Fugacity \Fu*gac"i*ty\, a. [L fugacitas: cf. F. fugacit['e].]
1. The quality of being fugacious; fugaclousness; volatility;
as, fugacity of spirits. --Boyle.
[1913 Webster]

2. Uncertainty; instability. --Johnson.
[1913 Webster]


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  • What is fugacity? - Chemistry Stack Exchange
    The fugacity of a molecular species is the same in two phases when these phases are in equilibrium as regards the distribution of that species The fugacity of a gas approaches the gas pressure as a limiting value if the gas is indefinitely rarefied In other words, the escaping tendency of a perfect gas is equal to its gas pressure
  • Is fugacity the corrected pressure that should be used in . . .
    Fugacity is not the actual pressure It is used to account for the real behaviour of gasses and also to overcome the assumption that chemical potential for a real gas can be based on using that based on an ideal gas $\mu=\mu^\text {o}+RT\ln (P (atm) 1 (atm))$ rather than starting over again with, say, the van der Waals eqn
  • Physical significance of chemical potential and fugacity
    The mathematical relation between fugacity and chemical potential was chosen to resemble that between partial pressure and chemical potential in the ideal state This allows one formulation to describe both real scenarios and the limiting ideal case
  • When is the activity of a gas given by its partial pressure?
    The fugacity coefficient is a measure of non-ideality owing to the intermolecular forces between molecules At high pressures, the forces are significant and so the system is non-ideal, $\phi$ is not one, and the fugacity does not approximate the partial pressure, even though the partial pressure is small
  • Activities and molar concentrations - Chemistry Stack Exchange
    The idea of fugacity is thus evolved from the use of vapor pressure as a measure of escaping tendency When a substance is in equilibrium with its vapor, the fugacity, in order to fulfil the laws of escaping tendency, must be the same i both The fugacity of a substance is therefore equal to its vapor pressure if the vapor behaves like a
  • Fugacity vs compressibility - Chemistry Stack Exchange
    if the criterion is fugacity, it is not so intuitive to say that the forces of attraction are dominant and the real gas has a molar volume greater than that of an ideal gas
  • 5. The saturation pressure of n-octane at 427. 85 K is 0. 215 . . . - bartleby
    Transcribed Image Text: 5 The saturation pressure of n-octane at 427 85 K is 0 215 MPa Estimate the fugacity of n-octane at 427 85 K and 1 0 MPa Data: molar volume of liquid = 0 2003 x 103 m³ mol¹, Tc = 569 4 K, Pc = 24 97 bar and w = 0 398
  • 11. 18. Estimate the fugacity of isobutylene as a gas: (a) At . . . - bartleby
    Solution for 11 18 Estimate the fugacity of isobutylene as a gas: (a) At 553 15 K (280°C) and 20 bar; (b) At 553 15 K (280°C) and 100 bar
  • physical chemistry - Concept of Absolute Thermodynamic Activity . . .
    Yes, but he references this definition to the thermodynamics textbook by Guggenheim I checked this textbook, but have to say I'm not a huge fan of its explanations regarding chemical potential and activity relationships It's the only thermo textbook I came across which uses the concept ''absolute activity'' and says that it's independent of the standard state
  • 2) Using the viral equation of state, estimate the fugacity (in bar . . .
    2) Using the viral equation of state, estimate the fugacity (in bar) and fugacity coefficient for carbon tetrachloride (CC14) at 70 0 °C and 50 0 bar At 70 °C, the vapor pressure of CCl4 is 614 0 mmHg, and the saturated liquid and vapor densities can be taken as 1500 0 kg m-³ and 4 57 kg m-³





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