On Thu, 11 Mar 2010, Alan B Pearce wrote:

> > I'm trying to understand an aspect of the simultaneous diffusion
> > (effusion?*)  of several gases through a permeable membrane between two
> > spaces.
> 
> Isn't this 'osmosis' ??
> 
> Hmm, Wikipedia thinks this is for liquids, but i thought it included gases.
> http://en.wikipedia.org/wiki/Osmosis

You might want to look up chromatography

Regards
Sergio Masci
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