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The speed of an airplane is measured by a system known as the pitot-static system which compares the difference between the static air pressure that exists around the aircraft and the dynamic, or ram air pressure which is a function of the speed the aircraft is moving through the air. The devices used to gather this information are the static air port (which measures static air pressure) and the pitot tube (which measures ram air pressure). This differential is displayed on an instrument in the cockpit called an airspeed indicator (or ASI).

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Q: What instrument is used to measure the speed of an airplane?
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