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US Standard Atmosphere

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US Standard Atmosphere

Not to be confused with International Standard Atmosphere.

The U.S. Standard Atmosphere is a series of models that define values for atmospheric temperature, density, pressure and other properties over a wide range of altitudes. The first model, based on an existing international standard, was published in 1958 by the U.S. Committee on Extension to the Standard Atmosphere, and was updated in 1962, 1966, and 1976.


1962 version

The basic assumptions made for the 1962 version were:[1]

  • air is a clean, dry, perfect gas mixture (cp/cv = 1.40)
  • molecular weight to 90 km of 28.9644 (C-12 scale)
  • principal sea-level constituents are assumed to be:
    • N2–78.084%
    • O2–20.9476%
    • Ar–0.934%
    • CO2–0.0314%
    • Ne–0.001818%
    • He–0.000524%
    • CH4–0.0002%.
  • assigned mean conditions at sea level are as follows :
    • P = 101325 Pa = 0.1013250 MN/m2 = 2116.22 psf = 14.696 psi = 29.92 In-Hg
    • T = 288.15 K = 15 °C = 59 °F
    • ρ = 1.225 0 kg/m3 = 0.0764734 lbm/ft3
    • g = 9.80665 m/s2 = 32.174 1 ft/s2
    • R = 8.31432 J/mol-K = 1545.31 ft lb/lbmol-°R.

1976 version

This is the most recent version and differs from previous versions only above 32 km:

Subscript b Geopotential
altitude above MSL[2]
Static pressure Standard temperature
(K)
Temperature Lapse Rate
(m) (ft) (pascals) (inHg) (K/m) (K/ft)
0 0 0 101325 29.92126 288.15 -0.0065 -0.0019812
1 11,000 36,089 22632.1 6.683245 216.65 0.0 0.0
2 20,000 65,617 5474.89 1.616734 216.65 0.001 0.0003048
3 32,000 104,987 868.019 0.2563258 228.65 0.0028 0.00085344
4 47,000 154,199 110.906 0.0327506 270.65 0.0 0.0
5 51,000 167,323 66.9389 0.01976704 270.65 -0.0028 -0.00085344
6 71,000 232,940 3.95642 0.00116833 214.65 -0.002 -0.0006096

See also

References

  • U.S. Extension to the ICAO Standard Atmosphere, U.S. Government Printing Office, Washington, D.C., 1958.
  • U.S. Standard Atmosphere, 1962, U.S. Government Printing Office, Washington, D.C., 1962.
  • U.S. Standard Atmosphere Supplements, 1966, U.S. Government Printing Office, Washington, D.C., 1966.
  • U.S. Standard Atmosphere, 1976, U.S. Government Printing Office, Washington, D.C., 1976 (Linked file is 17 MiB).

External links

  • NASA GSFC ModelWeb
  • A mathematical model of the 1976 U.S. Standard Atmosphere
  • Online 1976 US Standard Atmosphere calculator and table generator
  • Calculate 28 properties of 1976 Standard Atmosphere
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