How are dust gathered in a certain place(eg. cabinet) even though its enclosed that never had been opened?
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Most places like cabinets are not air tight, so small bits of dust can still get in. It’s much slower than items left out of a shelf, but still there.
Closed cabinets aren’t airtight. The gaps around the doors are big enough to let some dust drift in. Compare to an open shelf and you’ll see that inside cabinets gets much less dust, but still some.
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