Describe, stating the necessary precautions an experiment to measure the coefficient of viscosity of a liquid using Stroke’s law.

• A liquid of known density, ρ, is put in a tall transparent glass with reference marks A and B, h metres apart
• A spherical solid of radius a and density, σ, is dropped into the liquid and time t taken to drop from A to B is determined.

Assumptions

The spherical solid moves with terminal velocity by the time it reaches A

Precautions

• The glass tube should be very wide compared to the diameter of the ball.
• The point C should be far away from the top of the tube
• Temperature is constant

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