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What Is Viscosity? How Many Methods Of Expression For Viscosity?
Sep 15, 2017
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When the liquid is moved by external forces, the measurement of friction resistance between the molecules is called viscosity. 

The greater the friction resistance, the greater the viscosity; The smaller the friction resistance, the smaller the viscosity.

Viscosity generally has five methods of expression: It is the Dynamic viscosity, the Kinematic viscosity, the Engler viscosity, the Redwood viscosity and the Saybolt viscosity. 

Now use the kinematic viscosity as international standard.

The Kinematic viscosity is a measurement of friction resistance during the liquid flows under the action of gravity, Its value is expressed in (M²/S),usually use(MM2/S).