Airspeed

ratio of speed of object moving through fluid and speed of sound

speed that exceeds the speed of sound

speed that is faster than Mach 5

obstacle to achieving supersonic speed

measure

instrument used in an aircraft to display the craft's airspeed, typically in knots, to the pilot

Transonic (or transsonic) flow is air flowing around an object at a speed that generates regions of both subsonic and supersonic airflow around that object. The exact range of speeds depends on the object's critical Mach number, but transonic flow is seen at flight speeds close to the speed of sound (343 m/s at sea level), typically between Mach 0.8 and 1.2.

standard airspeed defined as important to aircraft operation

thumb|right|An airspeed indicator is a [[flight instrument that displays airspeed. This airspeed indicator has standardized markings for a multiengine airplane.]] thumb|Aircraft have pitot tubes for measuring airspeed.

flight below 90 kilometres at speeds above Mach 5

speed of the aircraft relative to the airmass in which it is flying

airspeed read directly from the airspeed indicator (ASI) on an aircraft

Wikimedia list article

calibrated airspeed corrected for the compressibility of air at a non-trivial Mach number

indicated airspeed corrected for instrument and position error

Relationship between drag on an aircraft and other variables

principle in aeronautics