A book with two aims for two audiences: for the student, it shows how the fundamental principles underlying the behavior of fluids as can be applied to the solution of practical engineering problems; for the engineer, it hopes to serve as a reference of current information and basic analytical practices. Darby's (chemical engineering, Texas A&M U.) book builds from specific cases to more general theories. As a textbook it is intended for a first course in fluid dynamics covering macroscopic mass, energy and momentum balances, flow of Newtonian and non-Newtonian incompressible fluids, adiabatic flows, and more. This second edition includes a new chapter on two-phase flow; other chapters have been clarified. Book illustrates many of the concepts presented with simple drawings, and has extensive appendixes.