Theory of Nonlinear Acoustics in Fluids Physical theory of nonlinear acoustics Basic methods of nonlinear acoustics Nonlinear waves with zero and vanishing diffusion Nonlinear plane diffusive waves Nonlinear cylindrical and spherical diffusive waves Nonlinear bounded sound beams Nonlinear standing waves in closed tubes. The aim of the present book is to present theoretical nonlinear aco tics with equal stress on physical and mathematical foundations. We have attempted explicit and detailed accounting for the physical p nomena treated in the book as well as their modelling and the f mulation and solution of the mathematical models. The nonlinear acoustic phenomena described in the book are chosen to give phy cally interesting illustrations of the mathematical theory. As active researchers in the mathematical theory of nonlinear acoustics we have found that there is a need for a coherent account of this theory from a unified point of view covering both the phenomena studied and mathematical techniques developed in the last few decades. The most ambitious existing book on the subject of theoretical nonlinear acoustics is ”Theoretical Foundations of Nonlinear Aco tics” by O. V. Rudenko and S. I. Soluyan (Plenum New York 1977). This book contains a variety of applications mainly described by Bu ers’ equation or its generalizations. Still adhering to the subject scribed in the title of the book of Rudenko and Soluyan we attempt to include applications and techniques developed after the appearance of or not included in this book. Examples of such applications are resonators shockwaves from supersonic projectiles and travelling of multifrequency waves. Examples of such techniques are derivation of exact solutions of Burgers’ equation travelling wave solutions of Bu ers’ equation in non planar geometries and analytical techniques for the nonlinear acoustic beam (KZK) equation.