![]() This leads us to the fact that dynamic viscosity is a constant property, but kinematic viscosity is a derived property. Kinematic viscosity has units of diffusivity, (length) 2/s, which means that kinematic viscosity is sometimes known as diffusivity of momentum, dependent on thermal and mass diffusivity. In Newton’s Law of Viscosity equation, the proportionality constant is μ or dynamic viscosity. Kinematic viscosity of common liquids and fluids A conversion from absolute to kinematic viscosity in Imperial units can be expressed as. ![]() The ratio of shear stress to shear rate is defined as the viscosity. A more exact kinematic viscosity for water at 20.2 o C (68.4 o F) is 1.0038 mm 2 /s (cSt). Newton’s Law of Viscosity states that shear stresses between parallel layers of fluid are proportional to the corresponding velocity gradients. Table 1.3 lists the absolute ( dynamic ) viscosities of common fluids in.
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