[Diy_efi] way off topic - waterproof technology

[Mike Yates]

Ok then let me revise my requirements...

I need a membrane of sort description that with very little pressure
differential will allow atleast one component of "air", preferably
nitrogen, to pass thru but will not allow H2O in any form to permeate.

I'm not sure how much more reasonable this is but i believe that
nitrogen atoms are smaller that water molecules.


M

On Wed, 24 Jan 2007 16:03:28 EST, you wrote:

> 
>In a message dated 24/01/2007 09:00:49 GMT Standard Time,  
>espresso_doppio at yahoo.com writes:
>
>"Air" is  a large collection of various compounds, and
>many of them are larger than  an H20 molecule; further,
>if H2O wouldn't come through at all, it wouldn't  be
>breathable.
>
>
>
>Awww come on guys, this just IS NOT TRUE.
> 
>Air is 80% Nitrogen, about 19% Oxygen, and the rest is mostly rare gases  
>like Argon, Neon, Krypton, etc with a trace of CO2.  There are no  "compounds" in 
>air except 0.03% CO2 of course.
> 
>Contaminated air with petroleum byproducts in suspension/aerosol etc may  
>well contain "compounds" but, in percentage terms, in vanishingly small  amounts. 
> The above figures still basically prevail.
> 
>Gore-Tex is permeable to gaseous compounds and elements.  It is  designed to 
>be RESISTANT to the passage of water DROPLETS (not vapour).
> 
>It may not do the job asked in the original post, but let's just remember  
>Chemistry 101....
> 
>Will
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