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mg of oxygen per liter to percent of oxygen in air

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  • mg of oxygen per liter to percent of oxygen in air

    Does anyone know this conversion?

    Thank you.

  • #2
    Re: mg of oxygen per liter to percent of oxygen in air

    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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    • #3
      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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      • #4
        Re: mg of oxygen per liter to percent of oxygen in air

        lpm*4+20=FiO2

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