Help with Poiseuille's Law

This calculator uses Poiseuille's Law to calculate the rate of flow of a fluid through a cylindrical pipe with laminar flow. The equation used is:

R = (pi*r⁴*(p₁-p₂)) / (8*n*L)

• R = Rate of flow
• p₁ = 1st pressure
• p₂ = 2nd pressure
• n = viscosity of fluid
• L = length
• r = inside radius

The viscosity of the fluid is measured in dyne sec/cm², poise.