Airspeed indicators show the aircraft's forward velocity in which unit of measurement?

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Multiple Choice

Airspeed indicators show the aircraft's forward velocity in which unit of measurement?

Explanation:
Airspeed indicators present speed relative to the surrounding air as knots. The instrument uses the pitot-static system to measure dynamic pressure and then calibrates that pressure to indicated airspeed, with the readout standardized in knots (nautical miles per hour) so pilots have a consistent reference worldwide. Knots are tied to aviation navigation, since flight planning and airspace use nautical miles; 1 knot is 1 nautical mile per hour, about 1.15 miles per hour. Mach is a separate measure used at high subsonic to supersonic speeds and may appear on other displays, but the standard airspeed indicator shows speed in knots.

Airspeed indicators present speed relative to the surrounding air as knots. The instrument uses the pitot-static system to measure dynamic pressure and then calibrates that pressure to indicated airspeed, with the readout standardized in knots (nautical miles per hour) so pilots have a consistent reference worldwide. Knots are tied to aviation navigation, since flight planning and airspace use nautical miles; 1 knot is 1 nautical mile per hour, about 1.15 miles per hour. Mach is a separate measure used at high subsonic to supersonic speeds and may appear on other displays, but the standard airspeed indicator shows speed in knots.

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