The book reviews, updates and integrates recent advances in the modelling and measurement of turbulent jets and plumes -- phenomena which are common to many areas of fundamental and applied scientific research. Contributions on key aspects of the subject are included as reviews and these reviews are supplemented by shorter, more specific articles on specialised topics. The book not only summarises the present state of the subject but also identifies the future outstanding problems and challenges to be addressed. In this regard, particular reference is made to developments in numerical and laboratory modelling, applications to oceanographic and meteorological flow problems and the incorporation of theoretical and laboratory data into outfall design and pollution control. The book is a reference text for all researchers concerned with fluid dynamical processes involving mixing and transport phenomena. The key features of the book are its timeliness and the way it draws together contributions from different branches of the subject.