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甲烷(CH_4)是以气体状态存在的一种碳氢化合物,无色无味可以燃烧,是矿山瓦斯和沼气的主要成分。人体内也存在甲烷。有人测得正常人肠内21小时甲烷排出量最高达128ml,大肠癌患者呼气中甲烷排出率可高达80～91.4％。
Methane (CH_4) is a hydrocarbon that exists in the gaseous state. It can be burned colorless and tasteless and is the main component of gas and methane in mines. Methane is also present in the body. Some people measured normal intestinal enteral 21 hours methane emissions up to 128ml, colon cancer patients exhaled methane emission rate as high as 80 ~ 91.4%.