The conclusion of Poiseuille’s law is that the flow rate of a fluid through a cylindrical tube is directly proportional to the fourth power of the tube’s radius and the pressure difference between the ends of the tube, and inversely proportional to the viscosity of the fluid and the length of the tube.

This means that if you increase the radius of a tube, the flow rate of the fluid will increase dramatically. Similarly, if you increase the pressure difference across the tube or decrease the length of the tube, the flow rate will increase. Conversely, if you increase the viscosity of the fluid, the flow rate will decrease.

Poiseuille’s law has many practical applications in fields such as engineering, medicine, and biology. It is used to predict blood flow through blood vessels, fluid flow through pipes, and many other fluid dynamics problems.