Viscosity is the resistance of a liquid to flow. Viscometer is used to measure the hardness of liquids of different densities. Viscometers measure the resistance of the liquid to flow, as well as the resistance to the movement of the solid body in the liquid. The temperature change changes the fluidity ratio, so the constant temperature is important in the analysis. Fixed Viscometer is generally used when detailed liquid detection is desired. Another form of viscosity measurement is the stretching method, that is, the spreading viscosity.
