What is the total mass of the earthrsquos atmosphere the, Ask an Expert

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What is the total mass of the Earth’s atmosphere? (The radius of the Earth is 6.37 x 10 6 m, and atmospheric pressure at the surface is 1.013 x10 5 N/m2 ). Think about why we can use such a simple equation to find the mass of the Earth’s atmosphere? Is this answer exact? Does this answer change with time?

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