Kelvin equation

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Kelvin equation describes the change of vapour pressure over liquid curved with a radius r (for example, in a capillary or over a droplet). The Kelvin equation is used for determination of pore size distribution of a porous medium using adsorption porosimetry.

\ln {P\over P_0}= - {2 \gamma V_m \over rRT}

where
P - actual vapour pressure
P0 - saturated vapour pressure
γ - surface tension
Vm - molar volume
R - universal gas constant
T - temperature

[edit] References

W. T. Thomson, Phil. Mag. 42, 448 (1871)
S. J. Gregg and K. S. W. Sing, Adsorption, Surface Area and Porosity, 2nd edition,Academic Press, New York, (1982) p.121

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