This text is the outgrowth of Stanley Middleman's years of teaching and contains more than sufficient materials to support a one-semester course in fluid dynamics. His primary belief in the classroom—and hence the material in this textbook—is that the development of a mathematical is central to the analysis and design of an engineering system or process. His text is therefore oriented toward teaching students how to develop mathematical representations of physical phenomena. Great effort has been put forth to provide many examples of experimental data against which the results of modeling exercises can be compared and to expose students to the wide range of technologies of interest to chemical, environmental and bio engineering students. Examples presented are motivated by real engineering applications and may of the problems are derived from the author's years of experience as a consultant to companies whose businesses cover a broad spectrum of engineering technologies.