Pitot tube

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Pi·tot tube

(pē-tō'),
a stationary L-shaped tube inserted in a fluid stream, with its opening upstream, and used for measuring the velocity of fluid movement at that point in terms of the pressure developed in the tube by the fluid impinging on it, compared to a second tube opening laterally or downstream.

Pitot,

Henri, French engineer, 1695-1771.
Pitot tube - a stationary L-shaped tube inserted in a fluid stream and used for measuring the velocity of fluid movement.
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In one instance the pressure loss was measured using Pitot-static tubes mounted at the duct centerline, at axial locations prescribed by ASHRAE Standard 120.
For cases where an internal support frame was absent the absolute roughness of the ducts based on test data obtained using Pitot-static tubes was 0.11 mm (0.0004 ft).