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Why Sawdust Explodes: Video of an Explosive Incident at a Furniture Factory
I remember reading years ago that one of the most dangerous places to work in the pre-industrial age was stone-ground flour mills, as the ground flour would hang in the air and ignite in a similar way as above.
same thing happens in grain cylos.\
you can do the same thing at home with corn starch and a torch. you 'puff' the starch in contact with the flame, makes for a large flame ball.
this is also why there is 'explosion proof' lighting.... not lighting that can withstand explosions, but lighting that is guaranteed not to cause explosion, via static sparks...