Pitot–static system

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What Wikipedia says

A pitot–static system is a system of pressure-sensitive instruments that is most often used in aviation to determine an aircraft's airspeed, Mach number, altitude, and altitude trend. A pitot–static system generally consists of a pitot tube, a static port, and the pitot–static instruments.

Excerpt from the Wikipedia article “Pitot–static system”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Federal Aviation Administration, Public domain, via Wikimedia Commons.