International Standard Atmosphere


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International Standard Atmosphere

n
(Aeronautics) a theoretical vertical distribution of the physical properties of the atmosphere up to an altitude of 50 km established by international agreement. It permits the standardization of aircraft instruments and performance of all types of flying vehicles
References in periodicals archive ?
Therefore, a particularly simple inverse relationship exists, [[rho].sub.eq] [varies] 1/[g.sub.s], allowing translation of the surface gravity of an isoatmospheric planet to the Earth-equivalent air density (and hence also equivalent maximum flight altitude via the International Standard Atmosphere).
The International Standard Atmosphere (ISA) is an atmospheric model of how temperature and pressure vary with altitude.
The important thing to remember, however, is that this relationship is an estimate based on a model called the International Standard Atmosphere (ISA)--and this model is not always accurate.

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