Here's how it works. When you blow air into the bag, the air is pushed together, or "compressed." The compressed air pushes on the bag. This makes the bag push on the tabletop and child and lift them up. So the bag filled with compressed air can support their weight. The tires on your bike work in the same way. They are filled with compressed air and can support your weight. When the air leaks out of bike tires, they can no longer support your weight. That is why it's hard to ride your bike when the tires are flat.
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