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Density altitude is the altitude in the International Standard Atmosphere at which the air density would be equal to the actual air density at the place of observation. "Density Altitude" is the pressure altitude adjusted for non-standard temperature.
Both increase in temperature and increase in humidity cause a reduction in air density. Thus in hot and humid conditions the density altitude at a particular location may be significantly higher than the geometric altitude.
Additional recommended knowledge
Air density is perhaps the single most important factor affecting airplane performance. It has a direct bearing on:
As a result of a density altitude that is higher than the actual physical altitude, the following effects are observed:
Density altitude can be calculated from atmospheric pressure and temperature (assuming dry air).
Easy formula to calculate Density altitude from Pressure Altitude
This is an easier formula to calculate (with great approximation) Density altitude from Pressure Altitude and International Standard Atmosphere temperature deviation
Of course you'll need:
Outside Air Temperature
References and notes
This article incorporates text from Pilot's Handbook of Aeronautical Knowledge, a public domain work of the United States Government.
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Density_altitude". A list of authors is available in Wikipedia.|