Adam-Gibbs, generally equation

A fundamental equation derived by Gibbs is used to calculate the spreading pressure of films on solids where, unlike films on liquids, it cannot be experimentally determined. Guggenheim and Adam reduced Gibbs general adsorption equation to equation (7.3) for the special case of gas adsorption... 

The departure from Arrhenius behavior of the relaxation time arises, in the Adam-Gibbs theory, from the temperature dependence of the Sc term in equation (1), which itself is a consequence of the excess heat capacity ACp of equation (2). For constant Ap in equation (2), the degree of non-Arrhenius character, now called the fragility, is determined by the magnitude of ACp. A general but incomplete accord seems to exist between the fragility and ACp and exceptions, like the alcohols, can be rationalized by the presence of unusual Ap terms. 

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