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. ... Temperature and air pressure can vary from one place to another on the Earth, and can also vary in the same place with time. ... The density of air, ρ (Greek: rho) (air density), is the mass per volume of Earths atmosphere, and is a useful value in aeronautics. ... In aviation, pressure altitude is the indicated altitude when an altimeter is set to 1013 hPa (29. ...
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. Temperature is the physical property of a system which underlies the common notions of hot and cold; the material with the higher temperature is said to be hotter. ... Humidity is the concentration of water vapor in the air. ...
Density altitude can be calculated from atmospheric pressure and temperature (assuming dry air).
where
DA = density altitude P0 = atmospheric (static) pressure PSL = standard sea level atmospheric pressure (1013.25 hPa) T = true (static) air temperature TSL = standard sea level air temperature(288.15 K) b = 0.235
References
(1 December 1989) Air Navigation, Departments of the Air Force and Navy. AFM 51-40 / NAVAIR 00-80V-49.
Densityaltitude 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.
"DensityAltitude" is the pressure altitude adjusted for non-standard temperature.
Thus in hot and humid conditions the densityaltitude at a particular location may be significantly higher than the geometric altitude.
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