The calculation, interpretation and prediction of the physical quantities of moving particles and liquids need precise values of the viscosities. The most famous equations are Stoke's law for the velocity of a moving particle in a liquid, other translational and rotational frictional coefficients for different particle shapes, and Hagen-Poiseuille's law for the viscosity of a pure liquid. Furthermore viscosities are needed for many technical applications where liquids and liquid mixtures are forced to move from one place to another.
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