Describe how atmospheric pressure changes with altitude and explain why this occurs Explain your answer using Pressure in liquids (physics only) and depth.

Atmospheric pressure decreases with altitude because there are fewer air particles above a surface as height increases. With less weight of air above, the pressure exerted by the air decreases.

A strong answer should address (Physics only) Explain that pressure in a liquid increases with depth directly. Use the context of Pressure in liquids (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.