Sections :
International Standard Atmosphere (ISA)
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)
International Standard Atmosphere (ISA)
The International Standard Atmosphere (ISA) has been agreed to by many representative countries and entities in the aviation field. It is a representative model of the atmosphere and not an average. Most of the participants in aviation are in the northern hemisphere so this standard is based on the range of local weather conditions that occur in their locations. The standard results will need to be adjusted to suit weather conditions elsewhere.