# Illustration Pipe with Fluid and a Volumetric Flow Rate

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A pipe of length $$L$$ and radius $$R$$ has a fluid (e.g. water) flowing through it. A volumetric flow rate $$Q$$ (fluid volume per second) flows through the pipe due to a pressure difference $$\Delta \mathit{\Pi} = \mathit{\Pi}_1 - \mathit{\Pi}_2$$ at the beginning and end of the pipe.

The pipe serves as a sketch for Poiseulle's law.