Hagen–Poiseuille equation

The hagen–poiseuille equation is a way of finding out how much water will flow through a tube. It uses four things to work out the answer: the size of the tube, how long the tube is, how much water is inside the tube and how fast the water is moving. The bigger the tube, the longer the tube is, the more water inside the tube and the faster the water is moving, the more water will flow through the tube.