Book excerpt: This concise and well illustrated book is intended for students of chemical and mechanical engineering. It is concerned exclusively with gas-liquid flows. The first part deals with adiabatic flows, that is, flows without the addition or removal of heat. The second part deals with heat-transfer in two-phase flows: boiling and condensation. The various types of heat transfer are identified and methods to calculate them given. Two-phase flow and heat transfer are commonly encountered in heat exchangers (distillation and condensation) and in pipelines, and are therefore fundamental to many industrial chemistry processes.