It is well known that dust particles can ignite into fireballs. Even some substances that are not normally thought of as dangerous can turn deadly when ground fine and exposed to a heat source. In the case of the Taiwan fireball, the stage lights are thought to be that heat source. Common triggers for dust explosions can be static discharge, friction, “shorts” in electrical equipment and open flames.
When particles are less than 500 micrometres in diameter they are considered dust. They may be even finer than that. Explosions in grain elevators, mines and saw mills are fairly common, especially if rigorous maintenance in not observed.
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