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The tangential forces per unit area of the liquid layer required to maintain unit velocity gradient is known as:

1. coefficient of gravitation of liquid layer
2. coefficient of friction between layers
3. coefficient of viscosity of the liquid
4. temperature coefficient of viscosity

Correct answer: coefficient of viscosity of the liquid

Solution

By Newton’s law of viscosity, the tangential force per unit area needed to maintain a unit velocity gradient is the fluid’s viscosity. This is exactly the coefficient of viscosity, which quantifies internal friction in a liquid.

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