Answer:
Weight
Step-by-step explanation:
Pressure is the ratio of force and surface area. Thus, air pressure can be defined as the force exerted by the air over a surface area. This force exerted by the air is its weight.
Air pressure is the weight of the air column above a point. Air pressure depends on the density and length of the air column. At sea level, the density is high as compared to hills.
P = ρ g h