![]() 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. The ratio of shear stress to shear rate is defined as the viscosity. Newton’s Law of Viscosity states that shear stresses between parallel layers of fluid are proportional to the corresponding velocity gradients. ![]()
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