Many books devoted to studying of cavitation and high-voltage plasma processes are published lately. But only small part of these research works has real practical application accompanied with economic calculations. Some books are concerned with acoustical cavitation, others – with the hydrodynamic one, but some others – with high-voltage plasma phenomena only. The proposed monograph considers all these problems simultaneously. The author makes an attempt to emphasize common features and phenomena inherent to cavitation and high-voltage plasma processes. Mathematical and experimental methods of analysis are used. The results of investigation of author, his doctoral students and workers as well results of other researchers are presented in this book. The book is intended for mechanical and electrical engineers, physicists, specialists in high-voltage plasma equipment, instrument-makers, engineers in hydrodynamics, chemists, agronomists, biologists, ecologists, builders. It also will be useful for businessmen. Many specialists in different fields of engineering are usually involved in the process of adoption of new technologies and in making of new technological lines, plants and enterprises. This book can help to establish cooperation between them. The author tries to present the variety of nonlinear effects in their practical applications (only small part of totality of nonlinear effects is considered in this book).