煤氣(coal gas、town gas、illumination gas)係氣嘅一種,係燒得着嘅。佢係煤經分解,柝出易燃氣體嘅成份,好似氫、一氧化碳、甲烷、以及種種易揮發嘅碳氫化合物。佢亦有少量燒唔着嘅成份,好似二氧化碳同氮。
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