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From: nick;at;BCH.UMontreal.CA (Nick Blom)
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Subject: CCL:Answer to my question on osmotic pressure
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On Jan 31,  8:05pm, Eric Sribnick wrote:
> Subject: CCL:Answer to my question on osmotic pressure
> Thanks to everyone who wrote me.  This answer is indicative of the kind
> that I have been receiving (i.e. Nobody as of yet has told me that the
> solution would not come out of the tube).
>
> ---------- Forwarded message ----------
> Date: Tue, 31 Jan 1995 18:51:05 -0600 (CST)
> From:PEARLMAN-!at!-VAX.PHR.UTEXAS.EDU
> To: heysrib- at -cs1.presby.edu
> Subject: A question on osmotic pressure
>
> Hi --
>
> > If the tube part was cut down lower than the point where osmotic
> > pressure pushes the water up to, would water come out of the end
> > of the tube?
>
> YES!!  I've done this as a demonstration on several occasions.  You
> can actually get the solution to "shoot" out of the end of tube!
> Of course, if you allow the solution to fall back into the beaker,
> then the process grinds to a halt fairly quickly (as the concentrations
> on both sides of the membrane become almost equal).  But if you direct
> the flow from the tube away from the beaker and lower the thistle tube
> as necessary, you can almost empty the beaker.
>
> Have fun.
>
>  -- Bob Pearlman
>

NOT ALWAYS YES!: the surface tension at the end of the tube may resist waters
to spill over.




-- 
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Dr. Nick Blom			    Tel  : +1-514-3436111 ext 5352
Departement de Biochimie	    Fax  : +1-514-3432210
Universite de Montreal		    Email: nick ":at:" bch.umontreal.ca
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Montreal, PQ, H3C 3J7
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