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Poiseuille's law

American  
[pwah-zweez] / pwɑˈzwiz /

noun

Physics, Mechanics.

  1. the law that the velocity of a liquid flowing through a capillary is directly proportional to the pressure of the liquid and the fourth power of the radius of the capillary and is inversely proportional to the viscosity of the liquid and the length of the capillary.

Etymology

Origin of Poiseuille's law

First recorded in 1880–85; poise 2

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

But it is surprising that r is raised to the fourth power in Poiseuille's law.

From Textbooks • Aug. 12, 2015

The circulatory system provides many examples of Poiseuille's law in action—with blood flow regulated by changes in vessel size and blood pressure.

From Textbooks • Aug. 12, 2015

Figure 12.15 Poiseuille's law applies to laminar flow of an incompressible fluid of viscosity η through a tube of length l and radius r .

From Textbooks • Aug. 12, 2015

Deviations from Poiseuille’s law in the capillaries make only a small correction to these values.

From Nature • Apr. 4, 2014

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.