Free Atmosphere

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Free Atmosphere </dt>
That portion of the earth's atmosphere, above the planetary boundary layer, in which the effect of the earth's surface friction on the air motion is negligible, and in which the air is usually treated (dynamically) as an ideal fluid. The base of the free atmosphere is usually taken as the geostrophic wind level. Also called free air. [[/a>|/a>]] </dd>

References

This article is based on NASA's Dictionary of Technical Terms for Aerospace Use