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#1
04-14-2009, 06:30 AM
 Unregistered Guest Posts: n/a
mg of oxygen per liter to percent of oxygen in air

Does anyone know this conversion?

Thank you.
#2
04-14-2009, 08:56 AM
 JohnS Moderator Join Date: Dec 2007 Location: SE Michigan, USA Posts: 9,533 Rep Power: 19
Re: mg of oxygen per liter to percent of oxygen in air

Quote:
 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.
#3
09-22-2011, 02:31 PM
 BabylonBob Guest Posts: n/a
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.
#4
08-25-2012, 11:08 AM
 Unregistered Guest Posts: n/a
Re: mg of oxygen per liter to percent of oxygen in air

lpm*4+20=FiO2

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