## Does a Vacuum Cleaner work inside a Vacuum?

<jabberwocky><div class="vbmenu_control"><a href="jabberwocky:;" onClick="newWindow=window.open('','usenetCode','toolbar=no,location=no, scrollbars=yes,resizable=yes,status=no,width=650,height=400'); newWindow.document.write('<HTML><HEAD><TITLE>Usenet ASCII</TITLE></HEAD><BODY topmargin=0 leftmargin=0 BGCOLOR=#F1F1F1><table border=0 width=625><td bgcolor=midnightblue><font color=#F1F1F1>This Usenet message\'s original ASCII form: </font></td></tr><tr><td width=449><br><br><font face=courier><UL><PRE>A colleague asked me this and now it\'s doing my head in.\nSo does anyone know...\n"Does a Vacuum Cleaner work inside a Vacuum?"\n\n</UL></PRE></font></td></tr></table></BODY><HTML>');"> <IMG SRC=/images/buttons/ip.gif BORDER=0 ALIGN=CENTER ALT="View this Usenet post in original ASCII form">&nbsp;&nbsp;View this Usenet post in original ASCII form </a></div><P></jabberwocky>A colleague asked me this and now it's doing my head in.
So does anyone know...
"Does a Vacuum Cleaner work inside a Vacuum?"

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 Recognitions: Science Advisor I doubt it. The general principle of a vacuum cleaner is to generate a wind current in the hose by lowering the air pressure. In a vacuum, the pressure is starting at 0, so it can't be reduced.


mongobonix wrote: > A colleague asked me this and now it's doing my head in. > So does anyone know... > "Does a Vacuum Cleaner work inside a Vacuum?" > > No. As pressure approaches vacuum, pumps start pumping less and less molecules per second. It takes a very long time to pump a good vacuum, as people doing high vacuum experiments will testify. At zero pressure, a vacuum cleaner will just be a rotating disk that does no pumping. Gerard

## Does a Vacuum Cleaner work inside a Vacuum?

<jabberwocky><div class="vbmenu_control"><a href="jabberwocky:;" onClick="newWindow=window.open('','usenetCode','toolbar=no,location=no, scrollbars=yes,resizable=yes,status=no,width=650,height=400'); newWindow.document.write('<HTML><HEAD><TITLE>Usenet ASCII</TITLE></HEAD><BODY topmargin=0 leftmargin=0 BGCOLOR=#F1F1F1><table border=0 width=625><td bgcolor=midnightblue><font color=#F1F1F1>This Usenet message\'s original ASCII form: </font></td></tr><tr><td width=449><br><br><font face=courier><UL><PRE>On Sat, 12 Mar 2005 14:08:21 +0000, mongobonix wrote:\n\n&gt; A colleague asked me this and now it\'s doing my head in. So does anyone\n&gt; know...\n&gt; "Does a Vacuum Cleaner work inside a Vacuum?"\n\nNo. A vacuum cleaner works by sucking in air. It is the air that drags\ndirt particles with it. In vacuum, no air is present, hence this principle\ncannot work.\n\nIgor\n\n</UL></PRE></font></td></tr></table></BODY><HTML>');"> <IMG SRC=/images/buttons/ip.gif BORDER=0 ALIGN=CENTER ALT="View this Usenet post in original ASCII form">&nbsp;&nbsp;View this Usenet post in original ASCII form </a></div><P></jabberwocky>On Sat, 12 Mar 2005 14:08:21 $+0000,$ mongobonix wrote:

> A colleague asked me this and now it's doing my head in. So does anyone
> know...
> "Does a Vacuum Cleaner work inside a Vacuum?"

No. A vacuum cleaner works by sucking in air. It is the air that drags
dirt particles with it. In vacuum, no air is present, hence this principle
cannot work.

Igor



Fair question. It does not. If you were on the back end of a fan in space you would not get pulled towards just as you would not get a breeze if you were in front of it.



"mongobonix" wrote in message news:b2283cd9.0503110829.67dc7dc6@posting.google.com... > A colleague asked me this and now it's doing my head in. > So does anyone know... > "Does a Vacuum Cleaner work inside a Vacuum?" No, it needs air to work. Martin Hogbin



mongobonix wrote: > A colleague asked me this and now it's doing my head in. > So does anyone know... > "Does a Vacuum Cleaner work inside a Vacuum?" Only inside a dirty vacuum! :) That is, only when there is a little gas floating around to move the dirt with. It's the pressure of this gas that makes the vacuum cleaner work, not the "creation of a vacuum." Doug



mongobonix wrote: > A colleague asked me this and now it's doing my head in. > So does anyone know... > "Does a Vacuum Cleaner work inside a Vacuum?" (What's a vacuum cleaner? Does a diffusion pump qualify?) I can blow a balloon away very easily with a puff of air from several feet. I can't suck a balloon towards $me -$ unless it's close to my mouth. What changes to make this possible at close range? Boundary conditions?



"mongobonix" wrote in message news:b2283cd9.0503110829.67dc7dc6@posting.google.com... > A colleague asked me this and now it's doing my head in. > So does anyone know... > "Does a Vacuum Cleaner work inside a Vacuum?" If the vacuum is sufficiently dirty, the cleaner will work just fine. Dirk Vdm



mongobonix wrote in news:b2283cd9.0503110829.67dc7dc6@posting.google.com: > A colleague asked me this and now it's doing my head in. > So does anyone know... > "Does a Vacuum Cleaner work inside a Vacuum?" > > See if you can answer a related question: What is the sound of a fan operating in a vacuum?



mongobonix wrote: > > A colleague asked me this and now it's doing my head in. > So does anyone know... > "Does a Vacuum Cleaner work inside a Vacuum?" No. What would create the mass flow that entraps particulates? It's not much of a problem, though, for people don't live in local vacua unless they are encapsulated. The problem then is not harvesting pariculates, it is changing diapers. -- Uncle Al http://www.mazepath.com/uncleal/ (Toxic URL! Unsafe for children and most mammals) http://www.mazepath.com/uncleal/qz.pdf



No, it doesn't. In a vacuum the absolute pressure is (close to) zero. There is no air left. As the vacuum cleaner relies on it air pressure difference which it creates, it can't work anymore. A VC is basically a pump for air and as there is no air in a vacuum, there is nothing it can pump. It is like a pump which is designed to pump water. If there is no water to pump, the motor will still run, but it can't pump water any more. It will start to cavitate and be damaged after a short time.



"mongobonix" a écrit dans le message de news:b2283cd9.0503110829.67dc7dc6@posting.google.com... > A colleague asked me this and now it's doing my head in. > So does anyone know... > "Does a Vacuum Cleaner work inside a Vacuum?" Everybody would answer "no", nevertheless, what do you mean by "work", by "vacuum cleaner", and by "vacuum"? -- ~~~~ clmasse on free F-country Liberty, Equality, Profitability.