Sections :

International Standard Atmosphere (ISA)

Sea Level Conditions

ISA Variation with Altitude

Variation due to Local Ground Conditions

Variation of Density due to Humidity

Variation of Density with Extremely High Altitude

Tabulated Data :

Table of Atmosphere Properties.

Software :

Atmosphere Properties Web Calculator

Atmosphere Properties Calculator (MS Windows Executable)



Metric unit

Imperial Unit

Pressure, $P$ 101.3 kPa 2116.7 lbf/ft2
Density, $ρ$ 1.225 Kg/m3 0.002378 slug/ft3
Temperature, $T$ 15oC , 288.2 K 59 oF , 518oR
Speed of Sound, $a$ 340.3 m/s 1116.4 ft/s
Viscosity, $μ$ 1.789 x 10-5 Kg/m/s 3.737 x 10-7 slug/ft/s
Kinematic Viscosity, $ν$ 1.460 x 10-5m2/s 1.5723 x 10-4ft2/s
Thermal Conductivity, $k$ 0.02596 W/m/K 0.015 BTU/hr/ft/oR
Gas Constant, $R$ 287.1 J/Kg/K 1715.7 ft lbf/slug/oR
Specific Heat, $C_p$ 1005 J/Kg/K 6005 ft lbf/slug/oR
Specific Heat, $C_v$ 717.98 J/Kg/K 4289 ft lbf/slug/oR
Ratio of Specific Heats, $γ$ 1.40
Gravitational Acceleration, $g$ 9.80665 m/s2 32.174 ft/s2