Gibbs-Deuhem equation

Gibbs [2] derived a thermodynamic relationship between the surface or interfadal tension y and the surface excess F (adsorption per unit area). The starting point of this equation is the Gibbs-Deuhem equation, Eq. (4.1). At constant temperature, but in the presence of adsorption, Eq. (4.1) reduces to Eq. (4.3). 

Using the Gibbs model, it is possible to obtain a definition of the surface or interfacial tension y, starting from the Gibbs-Deuhem Equation (20.2), i.e.. 

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See also in sourсe #XX -- [ , ]

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