On the Nature of Foam. I. Stability of the Foam Produced by the Aqueous Solutions of Alcohols and Acids

(1) An apparatus for the measurement of the stability of foam has been described and the stability is measured by the height of the foam produced by the air current of a constant velocity. (2) The relation between the velocity of the air current v and the height H of the foam produced was examined and the equation S·v=H−a has been obtained, in which S is the stability of foam and a a constant. The value a is negligible compared with H under the conditions of the present experiments. (3) The measurements of the stabilities were carried out for the aqueous solutions of alcohols and fatty acids, from which several conclu？ions have been obtained.