Kelvin effect

The Kelvin equation describes the change in vapour pressure due to a curved liquid–vapor interface (meniscus) with radius (for example, in a capillary or over a droplet). The vapor pressure of a curved surface is higher than that of a flat and non-curved surface. The Kelvin equation is dependent upon thermodynamic principles and does not allude to special properties of materials. It is also used for determination of pore size distribution of a porous medium using adsorption porosimetry. The equation is named in honor of William Thomson, also known as Lord Kelvin.