What exactly is happening when you suck the air out of a glass bottle?

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In: Physics

You are reducing the air pressure inside. The air pressure outside remains the same, and the bottle is strong enough to resist the increased pressure difference. A balloon won’t work as well, when you suck the air out of it, it will collapse.

You’re lowering the air pressure inside the bottle, but glass is a rigid enough structure that it won’t collapse, so physics tries to pull stuff in to help equalize the pressure. If you do the same thing to a plastic bottle, the plastic collapses so there isn’t as big a difference in pressure, and physics doesn’t try to compensate in the same way.