[Diy_efi] way off topic - waterproof technology

[Mike Yates]

I cant type today 

M


On Wed, 24 Jan 2007 13:47:29 -0800, you wrote:

>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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>
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