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An aircraft flies at an altitude of 30,000 feet. Determine the air temperature (in [K]), air...

An aircraft flies at an altitude of 30,000 feet. Determine the air temperature (in [K]), air pressure (in [Pa]) and air density (in [kg/m3]) at this altitude, according to the standard atmosphere.

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Answer #1

According to the International Standard Atmosphere (ISA), the constants used are :

P0 = 101325 Pa = standard sea level pressure

T0 = 288.15 deg K = standard sea level temperature

g = 9.80665 m/s2 = gravitational constant

L = 6.5 deg K/km = temperature lapse rate

R = 8.31432 J/mol*deg K = Universal gas constant

M = 28.9644 gm/mol = molecular weight of dry air

The temperature an an altitude h is given by :

(1 feet = 0.0003048 km)

The pressure at an altitude h is given by :

The air density at altitude h is given by :

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