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Topic: Permeability for different gases  (Read 1880 times)

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Offline Hermano

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Permeability for different gases
« on: October 11, 2013, 10:44:41 AM »
Hi,

Can someone tell me why the permeability of a porous material is greater for nitrogen than for air?

Thanks
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Offline billnotgatez

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Re: Permeability for different gases
« Reply #1 on: October 11, 2013, 11:04:14 AM »
Please read forum rules
you have to show what work you have done so far to answer this question
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Offline Corribus

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Re: Permeability for different gases
« Reply #2 on: October 11, 2013, 12:18:43 PM »
What's the difference between nitrogen and air?
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What men are poets who can speak of Jupiter if he were like a man, but if he is an immense spinning sphere of methane and ammonia must be silent?  - Richard P. Feynman

Offline iScience

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Re: Permeability for different gases
« Reply #3 on: October 13, 2013, 01:33:26 AM »
huge hint: nitrogen is just N2 and 'air' is a mixture of about 21% O2, 78% N2, and about 1% Ar.

questions that will help you get your answer:

1.) what molecule is smaller, O2 or N2?

2.) why would more of N2 make it diffuse faster through a semi-permeable membrane? (hint: partial pressures)
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