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Re: Whats in Helium?



A quick calculation of the volume(s) involved and the lift generated should
tell you whether or not you are still dealing with
just helium or something else.
Come on guys.
8^)

Keith
N1XTK


-----Original Message-----
From: Bill Jones <wejones@megalink.net>
To: amsat-bb@AMSAT.Org <amsat-bb@AMSAT.Org>
Date: Friday, March 10, 2000 9:37 PM
Subject: Re: [amsat-bb] Whats in Helium?



> >Doesn't it have to do with the fact that Rubber balloons are porous and
you
> >not only let some of the helium out, but you also converted some to
another
> >gas.  Osmosis at it's best.
>
> Helium is a noble gas. It's inert. You can't convert it to another
> gas, at least not without a fusion reactor.
>
> It leaks out of rubber balloons because helium is a) monatomic (i.e.,
> it exists as individual He atoms, not as diatomic pairs like H2, O2,
> N2, Cl2, etc) and b) it is a very small atom to begin with. So it can
> go right through the pores in the rubber.

Relative to Bob's original question about whether his helium contains air,
I'd guess that it didn't.  I've seen exactly the same symptoms with helium
that was better than 99.999% pure.  My GUESS is that as others have said,
the
helium gets out by permeation through the rubber, but in addition, some air
goes through the rubber, since the air concentration is greater outside the
balloon than inside.  It won't permeate as fast as the helium, but it
doesn't
take as much to destroy the lift either.  Just my guess.


**************************************
*Bill Jones  N3JLQ  Sweden Maine     *
* wejones@megalink.net               *
* http://www.megalink.net/~wejones   *
**************************************
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