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Basic features of the young equation

Ahmed Kamel Helmy*, Eladio A.Ferreiro

The young equation describes the equilibrium of three heterogeneous masses in contact and are homogeneous quite up to the separating interfaces, with respect to the density of energy, entropy and the chemical potential of the components (chemical species). The basic characteristics of the interfacial energy terms of the equation and their interrelations especially for the solid-water-vapour system are examined in detail. The solid-vapour interfacial energy, the introduction of surface pressure in the Young equation and their relation with monolayer coverage of adsorbate are considered in detail. The stability of the system and the conditions under which the equation is applied are emphasized.