# Poiseuille law

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## Poi·seu·il·le law

(pwah-swē'),
in laminar flow, the volume of a homogeneous fluid passing per unit of time through a capillary tube is directly proportional to the pressure difference between its ends and to the fourth power of its internal radius, and inversely proportional to its length and to the viscosity of the fluid.
[Jean Léonard Marie poiseville]

## Poi·seu·il·le law

(pwah-soy' law)
In laminar flow, the volume of a homogeneous fluid passing per unit time through a capillary tube is directly proportional to the pressure difference between its ends and to the fourth power of its internal radius, and inversely proportional to its length and to the viscosity of the fluid.

## Poiseuille law

(pwa-zŭy′)
[Jean Marie Poiseuille, Fr. physiologist, 1799–1869]
A law that states that the rapidity of the capillary current is directly proportional to the fourth power of the radius of the capillary tube, the pressure on the fluid, and inversely proportional to the viscosity of the liquid and the length of the tube.

## Poiseuille,

Jean Léonard Marie, French physiologist and physicist, 1797-1869.
poise - the unit of viscosity equal to 1 dyne-second per square centimeter and to 0.1 pascal-second.
Poiseuille equation
Poiseuille law - describes the volume flow rate of a liquid through a tube.
Poiseuille space - Synonym(s): still layer
Poiseuille viscosity coefficient - an expression of the viscosity as determined by the capillary tube method.
References in periodicals archive ?
The Poiseuille law of the incompressible viscous flow is usually considered and the hydraulic resistance of a single conducting element (both tracheids and vessels) is calculated as [Z.sub.p] = 128 [micro]L/ ([pi][d.sup.4]), where L and d are the length and diameter of the conducting element, [mu] is the fluid viscosity.
The apparent values of shear stress, shear rate, and shear viscosity were calculated using the derivation of the Poiseuille law for capillary flow .

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