[Physics] If I take a bottle of air into space, and open it, then close it and come back to earth and open it one last time, what would happen

Question

I was reading this post, but no one seem to go further as to say what would happen if you brought the bottle back to Earth? Another thing I want to know is, what would now be in the bottle?

Answer 1

When opening the bottle in space, all the air that was initially in it will flow out due to the pressure difference. The inside of the bottle will then become approximatelly vacuum, so when you open it on Earth air will flow in it again. (Unless it's not sturdy enough (for example a plastic bottle), in which case it will be compressed/crumpelt before you open it).