This chapter contains sections titled: The equivalence of the force and energy description of surface tension and surface energy Derivation of the Laplace pressure equation Methods for determining the surface tension of liquids Capillary rise and the free energy analysis The Kelvin equation The surface energy and cohesion of solids The contact angle Industrial Report: Photographic-quality printing Sample problems Experiment 2.1: Rod in free surface (RIFS) method for the measurement of the surface tension of liquids Experiment 2.2 Contact angle measurements