Explain why the atmosphere becomes less dense at greater heights Explain your answer using Atmospheric pressure (physics only) and atmosphere.

The atmosphere becomes less dense at greater heights because the weight of the air above decreases. As altitude increases, there are fewer air molecules above a given point, resulting in lower air pressure and density.

A strong answer should address (Physics only) Explain that the atmosphere becomes less dense at greater height 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.