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Try some air pressure experiments.
Air pressure is a powerful thing. In fact, it is stronger than gravity pulling on water!
A drinking glass
An index card (that covers the glass’ entire mouth)
Air has mass and takes up space and trying to push it around won’t get you anywhere. Blow as hard as you can but that paper ball isn’t getting in the bottle. The bottle is already full of air, so blowing air in forces air out which takes the ball with it.
An empty plastic bottle
A table or other flat surface
Wadded ball of paper