The water in the closed tank shown below at 25°C is pressurized by the air above. The attached manometer contains both mercury and light oil. If h; = 1.40 m, h₂= 1.20 m, and h = 0.85 m; and the atmospheric pressure is 98 kPa, compute the gage pressure of the air at the top of the tank. Air Water Oil Mercury

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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.