Abstract
SummaryFoams from detergent solutions may show large differences in apparent viscosity or consistency. Procedures are given for relative measurement of this property.A decrease in foam consistency may be obtained with soap solutions upon addition of inorganic salt or of hardness. A critical temperature range exists for consistency of foams from detergent systems. Foams of high consistency may be altered to low consistency by raising the temperature.The data suggests a relation between foam consistency and the liquid drainage and surface viscosity characteristics of foam systems. High consistency values were obtained for foams having slow drainage rates and high surface viscosity. These characteristics for foams of detergent solutions are attributed to the presence of certain polar organic substances (e.g., saturated fatty alcohols and acids) which are strongly adsorded at the liquid‐air interfaces.
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