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Ppm of a gas

  1. Apr 1, 2005 #1
    a gas is x ppm by volume
    Liquids are mg/L
    but what about the gas?
  2. jcsd
  3. Apr 1, 2005 #2


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    Staff Emeritus
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    ppm is a mass ratio -

    ppm = parts per million = mg / kg = [itex]\mu[/itex]g/g

    To get mole fraction, one has to divide by the appropriate molecular mass.
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