The quality or state of being capable of catching fire and burning easily.
From Latin 'combustus' (burned) plus '-ibility' (from '-ibilis,' meaning capable of). This technical noun emerged in chemistry to describe the inherent burning potential of substances.
Combustibility is why coal miners test air in tunnels—coal dust has such high combustibility that even static electricity can trigger an explosion. It's an invisible danger that shaped mining safety worldwide.
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