<prompt> Poiseuilles hagen lawisF PAPB × 3.14 × r48nlF PAPB × 3.14 × r48nlF PAPB × 3.14 × r48nlF PA × PB × 3.14 × r48nl  <response>: Poiseuille-Hagen FormulaThe relation between the flow in a long narrow tube, the viscosity of the fluid, and the radius of the tube is expressed mathematically in the Poiseuille-Hagen formula: 