free atmosphere

noun

the part of the atmosphere that lies above the frictional influence of the earth's surface.

Also called free air.

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Based on the Random House Dictionary, © Random House, Inc. 2013.
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The record of temperature changes in the free atmosphere is considerably shorter.

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So there is no correct forecast of any of the observed climate changes between pattern number four and a sulfate-free atmosphere.

In the free atmosphere, the air's density decreases as the air is heated.

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