So I’m aware it’s because of pressure difference, but why does that matter? Why does the pressure try to equal out immediately and not just slowly wait as things move into it like they would in ambient pressure?
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Individual molecules move randomly. But random motion will average out to filling the vacuum because there is less resistance that way. Say you are an air molecule at the outlet of a pressurized tank in space. Behind you there are billions of angry other air molecules. If you go that way, there’s a good chance you will hit one and get sent flying back out. In front of you there is empty space. So on average way more air molecules will be moving out than in.
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