Pitot Tube

A pitot tube is a device that measures the velocity of airflow by measuring the pressure difference across a small opening. They consist of a tube, metal or plastic, with a small opening at one end, and a pressure gauge or transducer at the other end. When airflow passes over the opening, it creates a pressure difference that is proportional to the velocity of the airflow. Pitot tubes are often used to measure airflow in ducts or at grilles and diffusers.

They can also be seen used on aircraft and racing cars.
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