This volume illustrates the kinematics and governing equations for Newtonian fluid, showing how suitable approximation can help solve problems of practical importance. The book deviates from the practice of using gas tables and presents an approach more amenable to solution using computers. Control volume and the differential equation forms of governing equations are dealt with in detail, with the advantages and shortcomings of each approach shown by examples. Implications of frame-indifference and the laws of thermodynamics are detailed. Numerous examples are presented to explain the theory. For practitioners and students interested in applications, a detailed summary of relevant equations have been provided.