The adsorption of surface-active solutes at interfaces between two fluid phases has been shown to be analyzed thermodynamically by use of the equations derived by introducing two dividing planes chosen so as to make the excess numbers of moles of solvents of the phases with reference to them zero. The positions of the dividing planes have been related to the variation in the concentrations of the solvents. Finally, this geometric formalism of the thermodynamics of adsorption has been proven to be identical with the Hansen convention.
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