Tricky. Look at this (ref:...

  1. ferronium
    1,306 Posts.
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    17/06/16
    14:14
    Post #: 18057778
    Tricky. Look at this (ref: https://en.wikipedia.org/wiki/Atmosphere_of_Earth ) ...



    So the 407 ppm for atmospheric CO2 is by volume!

    So you using 2.13 is correct and my 5.15 is incorrect because I assumed it was ppm by mass. My BAD. Will have to recorrect my calcs.

    Go for it.
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