Navier–Stokes equations

In pheesics, the Navier–Stokes equations, named efter Claude-Louis Navier an George Gabriel Stokes, describe the motion o viscous fluid substances. These balance equations arise frae applyin Newton's seicont law tae fluid motion, thegither wi the assumption that the stress in the fluid is the sum o a diffusin viscous term (proportional tae the gradient o velocity) an a pressur term—hence describin viscous flow.