“Fluid Mechanics and Machinery” is a comprehensive guide designed for students, engineers, and professionals in mechanical and civil engineering. The book covers fundamental and advanced concepts in fluid mechanics, including fluid properties, flow dynamics, and machinery applications. The initial chapters introduce fluid properties, including viscosity, surface tension, and compressibility. It explains key principles such as Pascal’s Law, Archimedes’ Principle, and Bernoulli’s Theorem, providing a strong theoretical foundation. This section delves into hydrostatics and hydrodynamics, covering pressure measurement, buoyancy, and stability of floating bodies. It includes discussions on the continuity equation, momentum equation, and energy equation, illustrating fluid behavior in static and dynamic conditions. The book explores different types of fluid flow, including laminar and turbulent flow, and methods for measuring flow rate. Instruments such as Venturimeters, orifice meters, and Pitot tubes are detailed with their working principles and applications. A dedicated chapter focuses on dimensional analysis, Buckingham π theorem, and similitude principles. These concepts are essential in designing and testing fluid systems using scaled models. The behavior of fluid near solid boundaries is explained through boundary layer theory. It discusses concepts such as boundary layer separation, drag, and lift, which are crucial for aerodynamics and hydrodynamics. This section covers flow through pipes, Darcy-Weisbach equation, head losses due to friction, and methods for flow improvement. It also explains pipe network analysis, essential for hydraulic engineering applications. A significant portion of the book is dedicated to hydraulic machinery, including pumps, turbines, and compressors. It explains their working principles, classifications, performance characteristics, and efficiency calculations. The book provides in-depth insights into hydraulic turbines like Pelton, Francis, and Kaplan, along with centrifugal and reciprocating pumps. Performance testing and design aspects are also discussed. Real-world applications of fluid mechanics are highlighted in automotive, aerospace, marine, and environmental engineering. Practical case studies illustrate how theoretical principles are applied in industry. “Fluid Mechanics and Machinery” serves as an essential reference for mastering fluid dynamics and machinery operations. With theoretical explanations, solved examples, and practical applications, it is an indispensable resource for engineering students and professionals.