The ISA
- defines a standard atmosphere model.
- is referenced from the equator.
- is taken from 45 degrees latitude.
Explanation
The International Standard Atmosphere is referenced to conditions at 45 degrees latitude, giving the agreed baseline of 15 degrees C, 1013.25 hPa and a 1.98 degrees C per 1000 ft lapse rate at mean sea level. It is not referenced from the equator, where surface conditions are warmer, and it is a fixed standard rather than the live atmosphere.
Syed Hussain asking:
I think The ISA assume a standard day is the right answer
Community Comments (1)
S
sierra3 Posts: 3 11.02.2014 / 20:25
The international standard atmosphere are standard values of temp, press etc taken from 45 degrees latitude, it is a statement
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