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Homework Help: Calculating mass of the atmosphere

  1. Sep 13, 2010 #1
    1. The problem statement, all variables and given/known data

    Calculate the total atmospheric mass between 25S and 25N, between the pressure levels 300mb and 200mb. Assume the earth is a perfect sphere.

    2. Relevant equations

    Radius of the earth = 6378km
    1 degree latitude = 111km
    volume of cylinder = pi*r^2*h

    3. The attempt at a solution

    I have tried this solution using approximate, average heights of the 200 and 300mb pressure levels, and assuming the "band" of 25N and 25S is a cylinder. From here, I found the volume of the earth up to 200mb and subtracted it from the volume of the earth at 200mb, to get the volume between 200 and 300mb. However, my professor said there was a way to do this without estimating pressure heights, and I am unsure how to do this.
    Last edited: Sep 13, 2010
  2. jcsd
  3. Sep 24, 2010 #2
    Did you get the answer to this in the end or is it still open?
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