On the Nature of Foam. III. The Foam Formation of Ternary System, Acetic Acid–Benzene–Water

(1) The foam formation of liquid ternary system of acetic acid-benzene-water (ABW) has been measured by means of a shaking apparatus, and a diagram has been drawn between the degree of foam formation and the composition. (2) The foam formation of homogeneous system of ABW is analogous to that of acetic acid-ethyl ether-water (AEW), showing two maxima of foam formation. In the heterogeneous system of ABW, however, remarkable foam-formation can be observed, instead of mere emulsion droplets containing bubbles in the case of AEW-system. (3) The explanation of foam formation in heterogeneous ABW-system has been attempted.