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airspeed indicator

noun, Aeronautics
1.
a flight instrument showing the airspeed of an aircraft.
Abbreviation: ASI.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Encyclopedia Article for airspeed-indicator

airspeed indicator

instrument that measures the speed of an aircraft relative to the surrounding air, using the differential between the pressure of still air (static pressure) and that of moving air compressed by the craft's forward motion (ram pressure); as speed increases, the difference between these pressures increases as well.

Learn more about airspeed indicator with a free trial on Britannica.com
Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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