A piston 113 mm diameter and 150 mm long has a mass of 9 kg. It is placed in a vertical cylinder 115 diameter containing oil of dynamic viscosity 0.12 Pa · s and relative density 0.9 and it falls under its weight. Assuming that piston and cylinder are concentric, calculate the time taken for the piston to steadily through 75 mm

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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.