Quantitative estimation of polydispersity of gas–liquid foams

The expansion of equivalent (spherical) foam is suggested as a macroparameter characterizing high-expansion foam polydispersity. This parameter represents the role of foam polydispersity in various processes well. A simple device for this parameter measurement is described below. As an example of the capabilities of the method under consideration the results of the curves of change of the sparging foams polydispersity in time are given.