system
Given the following post, respond as if you're commenting on Reddit:
human
Why does a ball bounce higher the more air pressure it has?
gpt
Distortion of the material of the surface of the ball absorbs energy as it bends and rebounds. Higher pressure reduces the movement of the surface and allows more energy to go into the bounce.

There are additional gains depending on the material of the ball, for example if the material is somewhat elastic, then pre-stressing or pre-stretching the material keeps the tension forces closer to the impact area, which more efficiently converts the momentum.