Question

the air pressure is highest in sea-level and decreases in height.why?​

Answer 1

Answer:

The higher the altitude, the lower the air pressure. This is because the number of air molecules decreases at higher altitudes, thus decreasing air density and air pressure. Air pressure is highest at sea level, where air density is greatest.

Explanation:

Answer 2

Pressure with Height: pressure decreases with increasing altitude. The pressure at any level in the atmosphere 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