Aviation standards and flying rules are based on the International Standard Atmosphere.
2.
Atmospheric Pressure covers the relationship between altitude and pressure in the International Standard Atmosphere.
3.
The average atmospheric pressure at sea level is defined by the International Standard Atmosphere as.
4.
Flight levels are altitudes corrected and calibrated against the International Standard Atmosphere ( ISA ).
5.
For example, an aircraft flying at in the international standard atmosphere with an IAS of, is actually flying at TAS.
6.
At sea level at 15�C at ISA ( International Standard Atmosphere ), air has a density of approximately 1.22521 kg / m 3.
7.
This is defined as the equivalent altitude above mean sea level having the same atmospheric pressure according to a standard atmospheric model such as the International Standard Atmosphere.
8.
In altimetry with the International Standard Atmosphere the hypsometric equation is used to compute pressure at a given height in isothermal layers in the upper and lower stratosphere.
9.
They are listed below, along with their values according to the International Standard Atmosphere, using for calculation the universal gas constant instead of the air specific constant:
10.
Airspeed indicators are calibrated on the assumption that they are operating at sea level in the International Standard Atmosphere where the air density is 1.225 kg / m 3.
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