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noun
the movement upward of air or other gas.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Based on the Random House Dictionary, © Random House, Inc. 2012.
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Link To updraft
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Updraft
is always a great word to know.
So is interrobang. Does it mean:
| a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question. |
| a screen or mat covered with a dark material for shielding a camera lens from excess light or glare. |
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
updraft  (ŭp'drāft') Pronunciation Key
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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Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Encyclopedia Britannica
Encyclopedia
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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