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venturi tube

[ven-too r-ee] /vɛnˈtʊər i/
noun
1.
a device for measuring the flow of a fluid, consisting of a tube with a short, narrow center section and widened, tapered ends, so that a fluid flowing through the center section at a higher velocity than through an end section creates a pressure differential that is a measure of the flow of the fluid.
Also, Venturi tube.
Origin
named after G. B. Venturi (1746-1822), Italian physicist whose work led to its invention
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for venturi tube

Venturi tube

/vɛnˈtʃuːrI/
noun
1.
(physics) a device for measuring fluid flow, consisting of a tube so constricted that the pressure differential produced by fluid flowing through the constriction gives a measure of the rate of flow
2.
Also called venturi. a tube with a constriction used to reduce or control fluid flow, as one in the air inlet of a carburettor
Word Origin
C19: named after G. B. Venturi (1746–1822), Italian physicist
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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10
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