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American Heritage Dictionary:
ef·fu·sion |
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Oxford Dictionary of Chemistry:
effusion |
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 by Answers.com:
effusion |
Oxford Dictionary of Sports Science & Medicine:
effusion |
A form of oedema in which there is an accumulation of fluid in a potential space, such as a joint capsule.
Word Tutor:
effusion |
Frank was touched by the effusion of good wishes from his colleagues at his retirement party.
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Saunders Veterinary Dictionary:
effusion |
1. escape of a fluid into a part; exudation or transudation. See also specific anatomic sites.
2. an exudate or transudate.
Random House Word Menu:
categories related to 'effusion' |
Rhymes:
effusion |
Wikipedia on Answers.com:
Effusion |
In physics, 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
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 deflates faster than an equivalent balloon full of higher molecular weight oxygen.
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Contents
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[2] Thomas Graham (1805-1869), a Scottish chemist, found experimentally that the rate of effusion of a gas is inversely proportional to the square root of the mass of its particles. In other words, the relative rates of effusion of two gases at the same temperature and pressure are given by the inverse ratio of the square roots of the masses of the gas particles.
In chemistry, the equation is given by
where M1 and M2 represent the molar masses of the gases. This equation is known as Graham's Law of Effusion.
The effusion rate for a gas depends directly on the average velocity of its particles. Thus, the faster the gas particles are moving, the more likely they are to pass through the effusion orifice. A figure of Graham's law of effusion linked below shows the rate of effusion (the rate at which the gas is transferred across the barrier through the pin hole) is inversely proportional to the square root of the mass of the gas molecules. See: [[File:Effusion of a gas into an evacuated chamber]]
This entry is from Wikipedia, the leading user-contributed encyclopedia. It may not have been reviewed by professional editors (see full disclaimer)
Translations:
Effusion |
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
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
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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 | American Heritage 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 |
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| Oxford Dictionary of Chemistry. A Dictionary of Chemistry. Sixth Edition. Copyright © Market House Books Ltd, 2008. All rights reserved. Read more |
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| Antonyms by Answers.com. © 1999-present by Answers Corporation. All rights reserved. Read more |
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| Oxford Dictionary of Sports Science & Medicine. The Oxford Dictionary of Sports Science & Medicine. Copyright © Michael Kent 1998, 2006, 2007. All rights reserved. Read more |
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| Word Tutor. Copyright © 2004-present by eSpindle Learning, a 501(c) nonprofit organization. All rights reserved. eSpindle provides personalized spelling and vocabulary tutoring online; sign up free. Read more |
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| Saunders Veterinary Dictionary. Saunders Comprehensive Veterinary Dictionary 3rd Edition. Copyright © 2007 by D.C. Blood, V.P. Studdert and C.C. Gay, Elsevier. All rights reserved. Read more |
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| Random House Word Menu. © 2010 Write Brothers Inc. Word Menu is a registered trademark of the Estate of Stephen Glazier. Write Brothers Inc. All rights reserved. Read more |
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Rhymes. Oxford University Press. © 2006, 2007 All rights reserved. Read more | |
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| Wikipedia on Answers.com. This article is licensed under the Creative Commons Attribution/Share-Alike License. It uses material from the Wikipedia article Effusion. Read more |
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| Translations. Copyright © 2007, WizCom Technologies Ltd. All rights reserved. Read more |
