Why does a plastic bottle that is sealed at a high altitude change it’s shape when taken to lower altitude

If the cabin air pressure is lower, there is less air for unit volume.

I'm pretty sur this is correct. I hope this helped!

- Because there is an inverse relation between altitude and the number of gas molecules striking the outer surface of the bottle (pressure exerted on it).

- Therefore, when the bottle is taken to lower altitude, the number of gas molecules striking the outer surface of the bottle increases and so changing its shape..

yes

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