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An instrument for measuring the viscosity of a fluid. In the Ostwald viscometer, used for liquids, a bulb in a capillary tube is filled with the liquid and the time taken for the meniscus to reach a mark on the capillary, below the bulb, is a measure of the viscosity. The falling-sphere viscometer, based on Stokes' law, enables the speed of fall of a ball falling through a sample of the fluid to be measured. Various other devices are used to measure viscosity.

Subjects: Physics.

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