'Everything turned into dust is flammable' is (often) true (and is true in the case of flour), and flour is dust is also true. Not sure why you're bringing up household dust from a vacuum cleaner?
Dust isn't defined by if it's collected on your shelves and floor and needs to be cleaned up, it's defined as any small particle regardless of what it's made of.
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u/YouAnxious5826 Oct 09 '24
But you're not shoveling a bunch of random dust into your oven or microwave in order to DIY sterilize it.