fugacity noun. [fjʊ'gasɪti] E17.
[formed as FUGACIOUS + -ITY.]
1. The quality of being fugacious; instability; transitoriness; volatility. E17.

2. Physics. A thermodynamic property of a (real) gas which if substituted for the pressure or partial pressure in the equations for an ideal gas gives equations applicable to the real gas; an analogous property of a solid or liquid derived using equations of the same form. E20.

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