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## Homework Statement

Determine the mass of air above a certain area on a typical winter day between ground level and 470m.

## Homework Equations

## The Attempt at a Solution

I found the total area which I need to find the mass of air for, which gave me 2.05x10^9m^2

I times that by the height of 470m, which gave me the volume, 9.66x10^11m^3

Now I think I need to find the density of air as a function of altitude, I am unsure on how to find the average density, do i need to find an equation and integrate? any help would be appreciated thanks.