Water (₁ = 62.4 lb/ft³) flows in a pipe. If the manometer connected as in Fig. is used with mercury as the fluid (y = 850 lb/ft³) and h is 5 inches when the level B is 15 inches above the centerline of the pipe, what is the pressure in the pipe? (Ans: PA = 3 psig or 17.7 psia)

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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.