Space isn’t a pure vacuum, there’s stuff in it, just not a lot of stuff.
But nature still “abhors” it. That’s why, if you went up in space in a spaceship, and you pressure that spaceship with air so that you can breathe in it, and then you opened a window on that spaceship, all the air would rush out into space in a millisecond.
Basically, nature hates difference in air pressure, and always wants to try to equalize them. The bigger the pressure difference, the more it wants to equalize.
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