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effusion

 
Dictionary: ef·fu·sion   (ĭ-fyū'zhən) pronunciation
n.
    1. The act or an instance of effusing.
    2. Liquid or other matter poured forth.
  1. An unrestrained outpouring of feeling, as in speech or writing: "the devout effusions of sacred eloquence" (Edmund Burke).
  2. Pathology.
    1. The seeping of serous, purulent, or bloody fluid into a body cavity or tissue.
    2. The effused fluid.

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Chemistry Dictionary: effusion
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The flow of a gas through a small aperture. The relative rates at which gases effuse, under the same conditions, is approximately inversely proportional to the square roots of their densities.



Antonyms: effusion
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n

Definition: outpouring
Antonyms: restraint


A form of oedema in which there is an accumulation of fluid in a potential space, such as a joint capsule.

Veterinary Dictionary: effusion
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1. escape of a fluid into a part; exudation or transudation. See also specific anatomic sites.
2. an exudate or transudate.

Word Tutor: effusion
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pronunciation

IN BRIEF: Free expression of words or feelings; an outpouring.

pronunciation Frank was touched by the effusion of good wishes from his colleagues at his retirement party.

Wikipedia: Effusion
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In chemistry, effusion is the process in which individual molecules flow through a hole without collisions between molecules. This occurs if the diameter of the hole is considerably smaller than the mean free path of the molecules.[1] According to Graham's law, the rate at which gases effuse (i.e., how many molecules pass through the hole per second) is dependent on their molecular weight; gases with a lower molecular weight effuse more quickly than gases with a higher molecular weight. For two gases at the same temperature (and having the same specific heat), and thus having the same kinetic energy, the root mean square molecular speed, vrms, of each gas can be found using the equation

32kBT = 12mv2rms

where kB is the Boltzmann constant. Thus, lighter molecules have a higher speed. This results in more molecules passing through the hole per unit time. This is why a balloon filled with low molecular weight hydrogen left alone for a reasonable amount of time deflates faster than an equivalent balloon full of higher molecular weight oxygen.

See also

References

  1. ^ K.J. Laidler and J.H. Meiser, Physical Chemistry, Benjamin/Cummings 1982, p.18

External links


Translations: Effusion
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Dansk (Danish)
n. - ordflom, udstrømning, blodudtrædning, væsleudtrædning, effusion

Nederlands (Dutch)
spraakwaterval, het uitstromen, uitvloeisel

Français (French)
n. - écoulement (d'un liquide), effusion (de sang), (fig) effusion, épanchement

Deutsch (German)
n. - Erguß, Ausströmen

Ελληνική (Greek)
n. - διάχυση, (μτφ.) (ποιητική) έξαρση

Italiano (Italian)
effusione

Português (Portuguese)
n. - efusão (f)

Русский (Russian)
излияние, кровоизлияние, поток (слов, эмоций)

Español (Spanish)
n. - efusión

Svenska (Swedish)
n. - utgjutning

中文(简体)(Chinese (Simplified))
泻出, 吐露, 流出, 强烈的情感流露

中文(繁體)(Chinese (Traditional))
n. - 瀉出, 吐露, 流出, 強烈的情感流露

한국어 (Korean)
n. - 유출, 유출물, 토로

日本語 (Japanese)
n. - 流出, ほとばしり, 発露, 流露, 表現

العربيه (Arabic)
‏(الاسم) اراقه, تدفق‏

עברית (Hebrew)
n. - ‮השתפכות, נזילה‬


 
 

 

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Dictionary. The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved.  Read more
Chemistry Dictionary. A Dictionary of Chemistry. Sixth Edition. Copyright © Market House Books Ltd, 2008. All rights reserved.  Read more
Answers Corporation Antonyms. © 1999-2009 by Answers Corporation. All rights reserved.  Read more
Sports Science and Medicine. The Oxford Dictionary of Sports Science & Medicine. Copyright © Michael Kent 1998, 2006, 2007. All rights reserved.  Read more
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