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Viscosity of a fluid, also called the coefficient of viscosity, absolute viscosity, or dynamic viscosity, is a measure of its resistance to flow. It is expressed as the ratio of the tangential shearing stresses between flow layers to the rate of change of velocity with depth
1)Viscosity decreases as temperature increases.
2)The pressure effect is neglected in various engineering applications.
Water at 70°F (21.1°C) has a viscosity of 0.00002050 lb s/ft2 (0.00098 N s/m2).
3)Viscosity divided by density is called kinematic viscosity.
4)In hydraulics, viscosity is most frequently encountered in the calculation of Reynolds number to determine whether laminar, transitional, or completely turbulent flow exists.
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