Meaning of Poiseuille's law

Poi•seuille's' law'

Pronunciation: (pwä-zwēz'), [key]
— Physics, Mech. Physics,Mech.
  1. the law that the velocity of a liquid flowing through a capillary is directly proportional to the pressure of the liquid and the fourth power of the radius of the capillary and is inversely proportional to the viscosity of the liquid and the length of the capillary.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.