This article is about reference atmospheric models. For weather prediction and climate models, see atmospheric model.
A reference atmospheric model describes how the ideal gas properties (namely: pressure, temperature, density, and molecular weight) of an atmosphere change, primarily as a function of altitude, and sometimes also as a function of latitude, day of year, etc.
A static atmospheric model has a more limited domain, excluding time.
A standard atmosphere is defined by the World Meteorological Organization as "a hypothetical vertical distribution of atmospheric temperature, pressure and density which, by international agreement, is roughly representative of year-round, midlatitude conditions."
Typical usages are as a basis for pressure altimeter calibrations, aircraft performance calculations, aircraft and rocket design, ballistic tables, and meteorological diagrams."[1]
For example, the U.S. Standard Atmosphere derives the values for air temperature, pressure, and mass density, as a function of altitude above sea level.
Other static atmospheric models may have other outputs, or depend on inputs besides altitude.
^National Oceanic and Atmospheric Administration; National Aeronautics and Space Administration; United States Air Force (October 1976), U. S. Standard Atmosphere, 1976(PDF), Washington, D.C.: U. S. Government Printing Office, p. xiv
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