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Kelvin equation

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The Kelvin equation is used to calculate the onset/occurrence of capillary condensation

\ln \left( \frac{p}{p_0}\right) = - \frac{2\gamma_{lg}}{RT\rho_lH}

Where p is the pressure, p_0 is the saturated vapour pressure, \gamma_{lg} is the liquid-gas surface tension for the bulk fluid, \rho_l is the density of the bulk fluid, R is the molar gas constant, T is the temperature and H is the pore or capillary width.