The Troposphere
The atmosphere beneath the stratified region is perpetually in
process of being mechanically mixed by wind and storm. When a
bulk of air is displaced vertically, its temperature, unlike its pressure,
has insufficient time for adjustment to the conditions obtaining at the
new level before it is moved away again. The properties of this
part of the atmosphere, to which most regular flying so far has been
restricted, are subject to considerable variations with time and place,
excepting that B varies only slightly, depending upon the humidity.
There exists a temperature gradient with respect to altitude, and on
the average this is linear, until the merge into the stratosphere is
approached.
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