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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It’s easier to picture if you don’t think of it as the vacuum pulling things in, but as everything else trying to push things out. Gravity is pulling all of the air (or water, etc.) down, which makes it all squish together near the ground. All of the air has other air all around it pushing on it.
At normal pressure this means the air mills about, bouncing off the other air and moving a little when it finds some less crowded space. A vacuum has (almost) no air, which means that the air next to it has a lot of push on one side and no push on the other. All of that other air pushes it into the empty space until it fills up, and then it has air pushing from all sides again.
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