Definition of fugacity in US English:



  • 1literary The quality of being fleeting or evanescent.

  • 2Chemistry
    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.

    • ‘The fugacity of sulphur dioxide becomes high enough for the gas to start escaping.’
    • ‘Eruption temperatures and oxygen fugacity were calculated using several methods.’
    • ‘You can always check by calculating the fugacity for yourself, using the equations in Pitzer and Sterner.’
    • ‘This method is also appropriate for introducing the activity of solution components and the fugacity of a real gas in gaseous mixtures.’
    • ‘Distribution of the asbestos typically shows a strong lithostratigraphic control, with bulk rock composition, oxygen fugacity, temperature, and structure all exerting an influence on fibre growth.’