Question

Why does atmospheric pressure decrease as we move upwards from the surface of the earth?

Answer 1

Atmospheric pressure: The pressure exerted by the layers of the atmosphere on the surface of the earth is called atmospheric pressure.

Barometer: It is an instrument used to measure atmospheric pressure.

Explanation:

1. When we move upwards from the earth's surface, the number of gas molecules in the air decreases, and air become less dense compared to air near the earth's surface.
2. So, air exerts less pressure at higher altitudes resulting in a decrease in atmospheric pressure.