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updraft

[uhp-draft, -drahft] /ˈʌpˌdræft, -ˌdrɑft/
noun
1.
the movement upward of air or other gas.
Origin
late Middle English
1400-1450
1400-50; late Middle English; see up-, draft
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Word Origin and History for up draft

updraft

n.

"rising air current," 1909, from up + draft (n.).

Online Etymology Dictionary, © 2010 Douglas Harper
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up draft in Science
updraft
  (ŭp'drāft')   
An upward current of warm, moist air. With enough moisture, the current may visibly condense into a cumulus or cumulonimbus cloud. Compare downdraft.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Encyclopedia Article for up draft

updraft

in meteorology, upward-moving and downward-moving air currents, respectively, that are due to several causes. Local daytime heating of the ground causes surface air to become much warmer than the air above, and, because warmer air is less dense, it rises and is replaced by descending cooler air. The vertical ascending current, called a thermal, may reach an altitude of 3 km (2 miles) or more. The greater the radius of the thermal, the higher it is likely to ascend. Updrafts and downdrafts also occur as part of the turbulence that is created when air passes over topographic barriers such as mountains.

Learn more about updraft with a free trial on Britannica.com
Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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