Question

how does atmospheric pressure changes with altitude explain in detail ​

Answer 1

That is, as the altitude increases, 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.

Pressure with Height: pressuredecreases with increasing altitude. The pressure at any level in theatmosphere may be interpreted as the total weight of the air above a unit area at any elevation. At higher elevations, there are fewer air molecules above a given surface than a similar surface at lower levels.