抄録
Drainage and deformation in, and diffusion of gas through the foam film are noticed as the basic factors affecting foaming. They are arranged in a table where the positive and negative contributions to the stability of foam are indicated. Dynamic nature of the foam film such as Gibbs-Marangoni effect, dynamic surface tension of expanding and contracting surface, and so-called surface transport play an important role in the elucidation of foam phenomena. Further, Ross' and Kulkarni's opinions proposed for the defoaming phenomena are examined and improved explanations are presented. Extension coefficient instead of Ross' spreading coefficient and rupture of foam film instead of Kulkarni's rupture mechanism of surface film of bulk solution are proposed. Distinction between foam inhibition and foam breaking is proved important, and both of these factors are inferred to be properly taken into account for the study of defoaming.
