3.1: Fundamentals of fluid mechanics
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A fluid is a substance, such a liquid or a gas, that changes its shape rapidly and continuously when acted on by forces. Fluid mechanics is the science that study how the fluid qualities respond to such forces and what forces the fluid applies to solids in contact with the fluid. Readers are referred to Franchini et al. [4]. More detailed information can be found in Franchini and García [3, Chap. 3].