•The surface tension causes an increased chemical
potential for a molecule inside
a droplet.This is manifested as an
increase in the vapor pressure P of the liquid droplet compared to that of the bulk
liquid P0. The is described
by the Kelvin equation.Two radii of
curvature appear in the result,
r1and r2.For a sphere both terms are equal, but for a
cylindrical surface one
term vanishes because one radius is infinite (flat).
The other parameters are: γ the surface tension, the molar volume of the liquid, R the gas constant, and T the absolute temperature.