The second edition of the book Surface Chemistry of Froth Flotation by Dr. S.R. Rao presents many significant advances of the 20 years since the publication of the first edition, including electrochemistry of sulfide flotation, use of chelating compounds in flotation, mechanism of activation and depression, inadvertent activation, fine particle flotation and several others of current interest to flotation engineers, researchers and graduate students. Dr. Rao has gathered recent published information and integrated it with established knowledge under various topics. The book also describes areas of ongoing research in the subject.