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  #1  
Old 04-14-2009, 06:30 AM
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Default mg of oxygen per liter to percent of oxygen in air

Does anyone know this conversion?

Thank you.
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Old 04-14-2009, 08:56 AM
JohnS JohnS is offline
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Default Re: mg of oxygen per liter to percent of oxygen in air

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Originally Posted by Unregistered
Does anyone know this conversion?

Thank you.
No, the density(mass of a liter) of air changes with temperature and pressure, so you would have to define those.

In "normal" air, it is 21% O2 on a mole fraction basis, or
21 mol O2 per 100 mol of air.

Since O2 has a moleculare weight of 32, and air 29, on a mass/mass basis, this is 0.21 x 32/29 = 0.232 kg O2/ kg air. That will be independent of temperature and pressure.

Divide by density of air at your temp. and pressure; you'll have mass of O2 per volume of air.
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Old 09-22-2011, 02:31 PM
BabylonBob
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Default Re: mg of oxygen per liter to percent of oxygen in air

I don't see any correction for the amount of water vapor in the air (gr/lb), which would affect the oxygen content.
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Old 08-25-2012, 11:08 AM
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Lightbulb Re: mg of oxygen per liter to percent of oxygen in air

lpm*4+20=FiO2
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