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### Standard Atmospheric Data for Altitude and Temperature for U.S

Standard Atmospheric Data for Altitude and Temperature - See Tables below....

U.S. Standard Pressure at altitude may be calculated from:

Equation 1
p = 14.696 · ( 1 - 6.8754 x 10-6 Z )5.2559

The formula for temperature as a function of altitude is:

Equation 2
t = 59 - 0.00356620 · Z

Where:

Z = altitude, ft
p = barometric pressure, psia
t = temperature, °F

Equations (1) and (2) are accurate from –16,500 ft to 36,000 ft. For higher altitudes, comprehensive tables of barometric pressure and other physical properties of the standard atmosphere, in both SI and I-P units, can be found in NASA (1976).

Table 1: Standard U.S. Atmosphere Pressure and Temperature Imperial Units

 Altitude, ft Temperature, °F Pressure, psia –1000 62.6 15.236 –500 60.8 14.966 0 59.0 14.696 500 57.2 14.430 1,000 55.4 14.175 2,000 51.9 13.664 3,000 48.3 13.173 4,000 44.7 12.682 5,000 41.2 12.230 6,000 37.6 11.778 7,000 34.0 11.341 8,000 30.5 10.914 9,000 26.9 10.506 10,000 23.4 10.108 15,000 5.5 8.296 20,000 –12.3 6.758 30,000 –47.8 4.371

Table 21: Standard U.S. Atmosphere Pressure and Temperature SI Units

 Altitude, m Temperature, °C Pressure, N/m2 –304.8 17.0 105048.5 -152.0 16.0 103186.9 0 15.0 101325.3 152.4 14.0 99491.3 304.8 13.0 97733.2 609.6 11.1 94209.9 914.4 9.1 90824.6 1219.2 7.1 87439.3 1524.0 5.1 84322.9 1828.8 3.1 81206.4 2133.6 1.1 78193.4 2438.4 -0.83 75249.4 2743.2 -2.83 72436.3 3048.0 -4.78 69692.2 4572.0 -25.96 57198.9 6096.0 -24.61 46594.7 9144.0 -44.33 30136.9

The standard atmosphere gives a standard of reference for estimating properties at various altitudes. At sea level, standard temperature is 59°F; standard barometric pressure is 14.696 psia or 29.921 in. Hg. Temperature is assumed to decrease linearly with increasing altitude throughout the troposphere (lower atmosphere), and to be constant in the lower reaches of the stratosphere.

The lower atmosphere is assumed to consist of dry air that behaves as a perfect gas. Gravity is also assumed constant at the standard value, 32.1740 ft/s2.

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