Explain why atmospheric pressure decreases as height above Earth's surface increases Explain your answer using Atmospheric pressure (physics only) and atmospheric pressure.

Atmospheric pressure decreases with height because there are fewer air particles above a surface at higher altitudes, resulting in less weight of air pressing down. As altitude increases, the density of air decreases, leading to lower pressure.

A strong answer should address (Physics only) Distinguish atmospheric pressure from liquid pressure and gas pressure in containers directly. Use the context of Atmospheric pressure (physics only) within Pressure and pressure differences in fluids (physics only), then state the relevant forces or motion reasoning with units where needed. The answer is correct when it names the key physics quantity, keeps force and pressure distinct, and links the conclusion back to the approved learning objective.