Abstract
Summary: It is believed that liquid films owe their stability to the Gibbs elasticity. How this elasticity may arise is discussed, and it is concluded that in some cases a nonequilibrium value may be the important concern. Some data on surface composition from radiochemical experiments and foam fractionation are presented. Finally an explanation of the origin of the slow and fast draining films of Ross, Miles, and Shedlovsky is offered.

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