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Astronomy: abundance, concentration, density

  1. Nov 29, 2013 #1
    1. The problem statement, all variables and given/known data

    Hi. I feel like this is probably very basic. Basically, I'm trying to understand how

    surface density * concentration = abundance

    I'm reading about gas surface density in the galaxy and its relationship to star formation, gas ejection etc. And we are given an equation that states

    d(gas surface density)/ dt = rate of gas ejection - rate of star formation

    then it goes on to say that the "abundance of a nuclide in the Interstellar Medium is the concentration times the density"

    and now they do a proof where d(surface density * concentration)/dt is supposed to be the rate of change of the element's abundance.

    I'm not understanding how multiplying a concentration by surface density would give an abundance. Can someone help explain this?

    2. Relevant equations

    3. The attempt at a solution
  2. jcsd
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