Wolfram|Alpha: Computational Knowledge EngineEquations - Air Density and Density Altitudeupdated: Dec 2, 2012 copyright 1998 - 2012 Richard Shelquist Density Altitude On-Line Calculators: For your convenience, the following density altitude calculators are available for use on this web site: - with dew point - using relative humidity What is density altitude? Density altitude is defined as the altitude at which the density of the International Standard Atmosphere (ISA) is the same as the density of the air being evaluated. So, the basic idea of calculating density altitude is to calculate the actual density of the air, and then find the altitude at which that same air density occurs in the International Standard Atmosphere. In the following paragraphs, we'll go step by step through the process of calculating the actual density of the air, and then determining the corresponding density altitude. Some different meanings of the word "altitude": As odd as it may seem, an aircraft altimeter does not actually know anything about altitude, it only measures pressure. Units: (4a) (4b) (12)
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