![]() The maximum velocity acquired by the body, falling freely in a viscous medium, is called terminal velocity.Įxpression. ![]() It was shown by Stokes that if a small sphere of radius r be moving with a uniform velocity υ (terminal velocity) through an infinite homogeneous and in compressible fluid of coefficient of viscosity η, it experiences a force F given by,ĭefinition. One poiseuille is coefficient of viscosity of a liquid if a force of 1 newton is required to maintain a velocity gradient of one metre per sec per metre between two layers, each of area one m 2. unit of coefficient of viscosity is a poiseuille (PI) or decapoise. One poise is coefficient of viscosity of a liquid if a force of 1 dyne is required to maintain a velocity gradient of one cm per sec per cm between two layers, each of area one cm 2. unit of coefficient of viscosity is poise (P). Hence, coefficient of viscosity may be defined as (or is equal to) the tangential force required to maintain a unit velocity gradient between two layers each of unit area. Due to relative motion, a backward dragging force F acts tangentially to every layer. Upper and upper layers move forward with increasing velocity. When liquid flows over a flat surface, liquid layer in contact with fixed surface AB does not move. After few minutes, it will come to stop due to internal friction acting between the layers of water. Take out the spoon from water and leave the water free. Take some water in a glass tumbler and stir it with a spoon for a minute. It is the property of a fluid by virtue of which an internal resistance comes into play when the fluid is in motion, and opposes the relative motion between its different layers.ĭemonstration. ![]() Physics Lab Manual NCERT Solutions Class 11 Physics Sample Papersĭefinition.
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