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Estimation of the Enhancement Factor for Mercury in Air



Allan H. Harvey


A combination of classical thermodynamics and molecular theory was used to calculate the enhancement factor (ratio of partial pressure to saturated vapor pressure) for liquid mercury in equilibrium with air at standard atmospheric pressure in the temperature range from 0 °C to 40 °C. The resulting enhancement factors range from 1.0021 at 0 °C to 1.0013 at 40 °C. This enhancement is too small in magnitude, and in the wrong direction, to explain a difference that has been noted between equilibrium vapor concentrations implied by the vapor pressure of mercury and concentrations assumed in some calibration procedures.
International Journal of Thermophysics


air, calibration, enhancement factor, mercury, nonideality, second virial coefficient, vapor concentration


Harvey, A. (2010), Estimation of the Enhancement Factor for Mercury in Air, International Journal of Thermophysics, [online], (Accessed March 2, 2024)
Created March 31, 2010, Updated February 19, 2017