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pitot tube
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pitot tube

Instrument that measures fluid (gas or liquid) flow. It is used to measure the speed of aircraft, and works by sensing pressure differences in different directions in the airstream.

It was invented in the 1730s by the French scientist Henri Pitot (1695-1771).

The pitot tube is a small, L-shaped tube that is inserted vertically into a flowing fluid with its open end facing upstream, thus measuring the total pressure of the fluid and indirectly the velocity of its flow.
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