Abstract
A simple floating bubble method for determining the permeability of adsorbed surface films to air is described. Data are presented for a selected group of pure detergents and detergent mixtures, and factors affecting the interpretation of the data in terms of foam stability are discussed. High foam stability depends on the adsorbed surface film having low permeability to air and high surface viscosity, and both of these effects may be the result of special solute pairs. Measurements of permeability and of surface viscosity provide valuable information regarding interreactions in adsorbed monolayers and in turn indicate the possibility of relating foam stability in a fundamental way to the chemical structure and composition of the detergent.
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