From this equation, one sees that a measure of the time it takes a specific volume to move
through a tube, usually with a diameter of no more than a few millimeters, under a constant
pressure drop is a direct measure of the viscosity.
There are many other other ways to measure viscous behavior. Another measurement of
viscosity relies on Stokes Law, which relates the viscous drag on a falling object to the viscosity
of the medium through which it falls, falling-ball viscometry.