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Old 25th Sep 2007, 06:40
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the incivil beast
 
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For the really curious out there, how does it separate nitrogen and oxygen?
Permeation of oxygen through a polymer membrane.
You pump bleed air into a hollow fiber (as thin as a hair) whose wall is made of a specific polymer through which oxygen diffuses much faster than nitrogen, at the far end of the fiber you get almost pure nitrogen. You need to bundle many fibers together to get significant flow.
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