An Etymological Dictionary of Astronomy and Astrophysics
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A device consisting of two vertical coaxial cylinders and a fluid filling the volume between the cylinders and used for measuring the viscosity of the fluid. The inner cylinder is stationary while the outer cylinder rotates. The amount of shear stress produced owing to rotation is directly proportional to the viscosity of the fluid.

→ Couette flow; → viscometer.

An instrument used to measure the → viscosity of a liquid. Same as viscosimeter.

→ viscosity; → -meter.