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Pitot tube

Pitot tube

A sensing device used to measure total pressures in a fluid stream. It was invented by a French physicist, Henri Pitot, in the 1700's (0301)A pitot tube is a very carefully calibrated “L” shaped tube within a tube that has the ability to pick up both air velocity and vacuum pressures at once. The pointed end of the tube in the diagram goes directly into the “wind” inside the duct and picks up the positive pressure of the incoming air on the pitot tip. The openings on the outside tube at the bottom of the “L” pick up the vacuum pressure in the duct.