Abstract
Common concepts for interpreting wetting experiments on solids are discussed in the light of the strict thermodynamics of heterogeneous systems. These concepts rest upon models of thermodynamic adhesion such as those given by Fowkes and Good. Application of the models introduces several assumptions and simplifications which mask the character of the interfacial tension and the adsorption — they are in fact quantities that do not belong to a certain phase but to the whole thermodynamic system. Experimentally accounting for all the measurable quantities seems to be tedious. An immediate caloric determination of the free energy change during wetting would circumvent many of the difficulties but also presents a considerable technical problem.
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