A sample of powdered zinc oxide, density 5.60 g/cm 3 , is allowed to settle under the acceleration of gravity, 981 cm/sec 2 , at 25 25°C. The rate of settling, v, is 7.30 ×10 3 cm/sec; the density of the medium is 1.01 g/cm 3 , and its viscosity is 1 centipoise = 0.01 poise or 0.01 g/cm sec. Calculate the Stokes diameter of the zinc oxide powder.

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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.