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Poiseuille's Law
---------------
In the case of smooth flow (laminar flow), the volume flowrate is
given by:
---> F
------------------
P1 P2
------------------
L
Volumetric flow, F = (P1 - P2)/R
Where R is the resistance to flow = 8ηL/πr4
r = radius
η = viscosity, Pa/s
Poiseuille's law is found to be in reasonable agreement with experiment
for uniform liquids where there is no appreciable turbulence.