Question

why atmospheric pressure vary with altitude ​

Answer 1

Answer:

As the altitude increases,the atmospheric pressure decreases. This is due to the fact that air molecules are constantly being pulled downwards (towards the center of the Earth) by Gravity. So, air molecules are tightly packed near the surface of the earth, compared to some higher altitude.

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Answer 2

Answer:

Atmospheric pressure is versely propotional to altitude. That is, as the altitude decreases, Atmospheric pressure decreases.

This is due to the fact that more molecules are constantly being pulled downwards by gravity. So, air molecules are tightly packed near the surface of the earth, compared to some higher altitude.