Why Does the Atmosphere Become Less Dense As Altitude Increases?

By Staff WriterLast Updated Mar 25, 2020 4:29:55 PM ET
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The atmosphere becomes less dense as altitude increases because there is less weight on the air molecules, making them less compressed. The air at lower altitudes is denser because it is pressed down by the weight of all the air molecules above. Also, the further away air molecules are from the Earth, the less weight they have because of a lower gravitational pull.