Poiseuille derived a formula for the rate of flow of viscous fluid through a cylindrical tube.
The formula is
V/t = (πPr4)/8ηl
Where
V = volume flowing in time t
t = time
P = pressure difference in the liquid at the two ends
r = radius of cylindrical tube
l = length of cylindrical tube
η = coefficient of viscocity of the fluid
(Chapter Fluid mechanics)
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