Using a minimum of mathematics, Rosen (surfactant research, City University of New York) describes properties and applications of surfactants, explaining the mechanisms by which these materials operate in interfacial processes such as foaming and wetting, and demonstrates correlations between a surfactant's chemical structure and its action. Reflecting advances in the field over the past 10 years, this third edition contains a new chapter on gemini surfactants, guidelines for the selection of surfactant pairs, and sections on "green" surfactants, dynamic surface tension reduction, and demulsification. Additional chapter problems are also provided.