The International Standard Atmosphere

Why do we need a standard atmosphere ?

We need a standard atmosphere to give us a datum from which to measure atmospheric (and as a result aircraft performance) variables.
The international standard atmosphere (ISA) specifies a number of parameters which describe variables in the atmosphere including (but not limited to) temperature, pressure and density.

ISA

Standard Values

 
Parameter
Value
Units
Temperature
15
° C
1225
g m3
1013.25
mb
0.00001789
kg s m-2
Example Content

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