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How is the coefficient of viscosity (η) defined in the context of force, velocity gradient, and area of contact?

Options

  1. AForce when velocity gradient is zero and area of contact is unit area
  2. BForce when velocity gradient is zero and area of contact is zero
  3. CForce when velocity gradient is unity and area of contact is zero
  4. DForce when velocity gradient is unity and area of contact is unit area

Correct answer

D. Force when velocity gradient is unity and area of contact is unit area

Step-by-step solution

The coefficient of viscosity (η) is defined as the force when the velocity gradient is unity and the area of contact is unit area.

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