Question

define viscosity constant​

Answer 1

Here is your answer

The degree to which a fluid resists flow under an applied force, measured by the tangential friction force per unit area divided by the velocity gradient under conditions of streamline flow.

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Answer 2

coefficients of viscosity is the degree to which a fluid resist flow under an applied force, measured by the tangential friction force per unit area divided by the velocity gradient under conditions of streamline flow.