Newton's Law for Fluids -- from Eric Weisstein's World of Physics

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Newton's Law for Fluids

The equation for the force per unit volume of a Newtonian fluid. It is given by

where p is the momentum of a fluid parcel, is the fluid density (assumed to be constant, i.e., the fluid is incompressible), is the substantive derivative, and u is the fluid velocity field.

Navier-Stokes Equations, Newton's Laws, Newtonian Fluid, Substantive Derivative, Viscosity