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[[File:Effusion.svg|thumb|250px|Effusion|The image in the left shows effusion, where the image on the right shows diffusion. Effusion occurs through an orifice smaller than the mean path of the particles in motion where diffusion occurs through an opening in which multiple particles can flow through simultaneously.]]
 
'''Effusion''' is the process in which a gas escapes through a small hole. This occurs if the diameter of the hole is considerably smaller than the [[mean free path]] of the molecules.<ref>K.J. Laidler and J.H. Meiser, Physical Chemistry, Benjamin/Cummings 1982, p.18</ref> 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 higher molecular weight effuse slower than gases with a lower molecular weight; the number of smaller molecules escaping will be greater but the mass of the larger molecules will be greater. For two gases at the same temperature <math>T</math>, and thus having the same kinetic energy,<ref>http://hyperphysics.phy-astr.gsu.edu/hbase/thermo/temper.html</ref> the [[root mean square]] molecular speed, <math>v_{\rm rms}</math>, of each gas can be found using the equation
 
:<math>\frac{3}{2}k_{\rm B} T  = \frac{m}{2} v_{\rm rms}^2</math>
<!-- The average speed would then be about 0.921 ''v''<sub>rms</sub>. -->
where <math>k_{\rm B}</math> 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]].
 
==Application to thermodynamics==
<ref>{{cite book|last=Zumdahl|first=Steven S.|title=Chemical Principles|year=2008|publisher=Houghton Mifflin Harcourt Publishing Company|location=Boston|isbn=978-0-547-19626-8|pages=164}}</ref> 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. The equation is given by
 
: <math>{\mbox{Rate of effusion of gas}_1 \over \mbox{Rate of effusion of gas}_2}=\sqrt{M_2 \over M_1}</math>
where <math>M_1</math> and <math>M_2</math> represent the molar masses of the gases.  
This equation is known as [[Graham's law|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.<ref>[http://img.sparknotes.com/content/testprep/bookimgs/sat2/chemistry/0003/sat117002_0510.gif Effusion of a gas into an evacuated chamber]</ref>
 
==References==
{{reflist}}
 
==External links==
* [http://library.thinkquest.org/12596/graham.html Graham's law]
 
[[Category:Physical chemistry]]
[[Category:Gases]]

Revision as of 02:55, 24 February 2014

If you compare registry cleaners there are a number of things to look out for. Because of the sheer number of for registry products available found on the Internet at the moment it may be very convenient to be scammed. Something frequently overlooked is the fact that certain of these products may truth be told end up damaging your PC. And the registry they say they have cleaned usually just cause more problems with a computer than the ones we started with.

Another solution would be to supply the computer program with a hot msvcr71 file. Frequently, once the file has been corrupted or damaged, it usually no longer be capable to function like it did before so it's just natural to replace the file. Just download another msvcr71.dll file within the internet. Often, the file may come inside a zip format. Extract the files within the zip folder and place them accordingly inside this location: C:\Windows\System32. Afterward, re-register the file. Click Start plus then choose Run. When the Run window appears, sort "cmd". Press Enter plus then kind "regsvr32 -u msvcr71.dll" followed by "regsvr32 msvcr71.dll". Press Enter again and the file ought to be registered accordingly.

With RegCure you are able to easily improve the start up plus shut down of your computer. The program shows the scan progress and we shouldn't worry where it's functioning at that time. It shows you what arises. Dynamic link library section of the registry may cause serious application failures. RegCure restores and repairs the registry plus keeps you from DLL. RegCure can create individual corrections, thus it can works for the needs.

If you feel we don't have enough money at the time to upgrade, then the number one choice is to free up some area by deleting a few of the unwanted files and folders.

The 2nd step to fixing these errors is to employ a program called a "registry reviver" to scan through a computer and fix some of the registry errors which could additionally be leading for this error. A registry cleaner is a software system that might scan through the computer and repair some of the difficulties which Windows has inside, allowing a computer to "remember" all the settings it has whenever it loads up. Although the registry is continually being employed to aid load up a large number of programs on your PC, it's continually being saved incorrectly - leading to a big amount of errors to be formed. To fix this problem, it's recommended we download a registry cleaner within the Internet and install it on a Pc, permitting Windows to run smoother again.

The most probable cause of the trouble is the program issue - Registry Errors! That is the reason why people whom absolutely have more than 2 G RAM on their computers are nevertheless consistently bothered by the issue.

Across the best of the scan results display page you see the tabs... Registry, Junk Files, Privacy, Bad Active X, Performance, etc. Every of these tabs can show you the results of which area. The Junk Files are mainly temporary files like internet information, images, internet pages... And they are just taking up storage.

There are many businesses that provide the service of troubleshooting your PC each time you call them, all we have to do is signal up with them and for a small fee, you have a machine always working effectively plus serve we greater.

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