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No no, this is clearly a pressure thing. When you vacuumed the room you sucked air (and dust) out of it into the hoover, lowering the pressure in the room as opposed to outside, which meant that the room had to expand slightly to accomodate ... hang on, I've got it wrong. The room should be shrinking, not expanding ... damn! It's high pressure vessels that expand when there's low pressure around them, which is why people's eyeballs burst in hard vacuum. Sorry, I can't explain it then. |
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