Application of the laws of force and motion to fluids is what fluid mechanics deals with. It has two main branches fluid statics and fluid dynamics. Fluid statics studies fluids at rest while fluid dynamics focuses on fluids in motion. It is applied to the areas such as industrial gas supply, designing of a hydro power plant, even water supply of a household. It is an active field of research, because of many problems that are fully or partially unresolved. This book is a compilation of chapters that discuss the most vital concepts and emerging trends in this area. It aims to shed light on some of the unexplored aspects of fluid mechanics and the recent researches in this field. It will help readers in keeping pace with the rapid changes in this discipline.