Using the widely accepted WGS84 ellipsoid model, this averages a nautical mile to 6,076 feet (1,852 meters), or 1. Find pressure height Elevation + (1013-QNH) x 30 2. Nautical Mile: defined as one minute of arc along a meridian of the Earth. The formula is density altitude pressure altitude + 120 x (OAT ISA Temp) What does that mean in English OAT is ‘Outside Air Temp’ or the Thermometer reading in Celsius and ISA Temp is the International Standard Atmosphere Temp.The more air molecules flowing over the wings, the more lift generated. It’s actually quite simple understanding density altitude. Stated differently, an airplane might feel (perform) as though taking-off or cruising at a higher altitude than actual. Statute Mile: the same as a standard mile as you would see driving a car Density altitude’s definition is pressure altitude corrected for non-standard temperature.
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