(a) A load acts on a piston of diameter D, as shown in Figure 2a. The piston rides on a tank of oil of depth hị and specific gravity SG. The tank is connected to a tube of diameter D; and oil rises in the tube to height h;. The oil in the tube is open to atmosphere. Load Piston hi DI Figure 2a

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Properties of Fluids

The term fluid represents a type of substance that can easily change its shape under any external pressure/force and can flow. Fluids can acquire any shape in which it is stored and can resist normal stresses but cannot resist shear stress in rest condition. Whenever external shear stress is applied to fluids, it starts to flow. The fluids may be liquid or gas. Example- water, air, etc.