What happens to air pressure as altitude increases?

As altitude increases, air pressure decreases. This phenomenon occurs because the atmosphere is composed of layers of air that become less dense at higher altitudes. The weight of the air above pushes down on the air below, creating atmospheric pressure. As you ascend, there are fewer air molecules above you exerting pressure, leading to a drop in air pressure.

In addition, the decrease in air pressure with altitude affects various aspects of aviation and meteorology. For example, reduced air pressure at higher altitudes can impact aircraft performance, as engines may receive less oxygen for combustion. This relationship is fundamental for understanding various flight dynamics, including lift and engine performance, and is crucial for flight planning and safety.