Hagen–Poiseuille equation

Rarity: Uncommon

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Science and technology

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What Wikipedia says

In fluid dynamics, the Hagen–Poiseuille equation, also known as the Hagen–Poiseuille law, Poiseuille law or Poiseuille equation, is a physical law that gives the pressure drop in an incompressible and Newtonian fluid in laminar flow flowing through a long cylindrical pipe of constant cross section.

Excerpt from the Wikipedia article “Hagen–Poiseuille equation”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Poiseuille_abstraction.JPG: Grajales at English Wikipedia derivative work: Antonysigma, Public domain, via Wikimedia Commons.