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CBSE Class 11-science Answered

Define coefficient of Viscosity.
Asked by Topperlearning User | 21 Apr, 2015, 01:27: PM
answered-by-expert Expert Answer

Co-efficient of viscosity is the force of friction required to maintain velocity difference of 1cm sec-1 between two parallel layers 1cm apart and having an area of 1cm2.

Or

The ratio of the shearing stress to the velocity gradient is a measure of the viscosity of the fluid and is called the coefficient of viscosity.

‘η’ is measure of viscosity. SI unit of viscosity coefficient is 1 newton second per square metre (N s m–2) = pascal second (Pa s = 1kg m–1s–1). In cgs system the unit of coefficient of viscosity is poise.

Answered by | 21 Apr, 2015, 03:27: PM
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