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If this is a physics question then it could be written as, "Why is every space which is not filled with something else, filled with air?" The same question could be, "Why does air fill every empty space it can find?"

The answer is "gravity". Gravity pulls the atmosphere as close to the Earth as it can. If there is a hole in the atmosphere such as an empty bottle, then the atmosphere has to sit a bit higher than it would like. By rushing some air into the bottle, there is a bit more space left down here for all the other molecules of air to settle into. You could say that the pressure of the air above pushes the air down here into every empty space it can find.

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12y ago

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