According to Poiseuille's law, the pressure needed to drive a fluid through a tube will increase under which of the following conditions?
I.increased fluid viscosity
II.decreased tube length
III.decreased rate of flow
IV.decreased tube radius

Question

Quizplus · Accepted Answer

According to Poiseuille's law, pressure is directly proportional to fluid viscosity and tube radius, and inversely proportional to tube length and rate of flow. Therefore, increased fluid viscosity (I) and decreased tube radius (IV) will increase the pressure needed to drive the fluid through the tube. Neither decrease in tube length (II) nor decreased rate of flow (III) will increase the pressure according to Poiseuille's law. Thus, the correct choice is C) I and IV.

According to Poiseuille's Law, the Pressure Needed to Drive a Fluid