Rotational viscometers operate under the principal of a rotational moving part, driven by a motor, in contact with the test fluid. The torque on the rotating shaft is then used to determine the ...

Viscosity is one of the standard physical properties used for qualifying many industrial products. Various types of viscometers are available, of which the rotational viscometer is the most efficient ...

Viscosity changes with temperature, and it is recommended to use calibration oils certified at the specific temperature for optimal viscometer performance. Image Credit: Paul N. Gardner Company, Inc.

When a force or stress is applied to a fluid, it flows, resulting in internal friction that resists the flow. Therefore, viscosity is defined as the internal friction of a fluid, or in other words, ...