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Why does vacuuming have a distinct smell that you can’t get anywhere else other than a vacuum?

If it was just the smell of dirt and dust why don’t we smell that other times? And if it’s the machine, no other machine makes that exact smell. What isssss ittttt
And don’t tell me it’s because it needs to be cleaned. Even a new or well taken care of vacuum has [u]the smell [/u]
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@swirlie beat me to it, but yeah, rapid heating and cooling of copper. Fun Fact: Hot bronze smells a lot worse, and yes I would know; I have a lantern whose fuel bulb is made of bronze.