The amount of force that air is placing on the Earth is called air pressure.

Here's a bit more detail:

* Air pressure is the weight of the atmosphere pressing down on the Earth's surface.

* It's measured in units like pascals (Pa) or millibars (mb).

* Higher altitudes have lower air pressure because there is less air above pushing down.

* Air pressure changes constantly due to weather patterns and other factors.

Let me know if you'd like to explore any of these aspects further!