Stokes' Law describes the force on objects passing through a fluid. It includes which property of the fluid usually represented by the Greek letter eta?
Stokes' law Stokes' law In 1851, George Gabriel Stokes derived an expression, now known as Stokes' law, for the frictional force – also called drag force – exerted on spherical objects with very small Reynolds numbers in a viscous fluid. Stokes' law is derived by solving the Stokes flow limit for small Reynolds numbers of the Navier–Stokes equations. The force of viscosity on a small sphere moving through a viscous fluid is given by: where: In SI units, "F" is given in newtons (= kg m s), "η" in Pa·s (= kg m s), "R" in meters, and "v" in m/s. Stokes'
Fluid function of strain rate. A consequence of this behavior is Pascal's law which describes the role of pressure in characterizing a fluid's state. Depending on the relationship between shear stress, and the rate of strain and its derivatives, fluids can be characterized as one of the following: The behavior of fluids can be described by the Navier–Stokes equations—a set of partial differential equations which are based on: The study of fluids is fluid mechanics, which is subdivided into fluid dynamics and fluid statics depending on whether the fluid is in motion. Fluid In physics, a fluid is a substance that