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在池沼、污泥塘和粪坑的表面,经常冒出许多气泡,如果稍一搅动则气泡更多,若用火去点这些气泡就能燃烧,这种能燃的气体,就是沼气。沼气在自然界存在很广,凡是有机物质(人、畜粪便,作物稭杆等),在一定的湿度、温度和密闭的条件下,经嫌气性细菌等发酵分解即能产生沼气。它的化学性质极为稳定,不溶于水,比空气轻。沼气为一种混合气体,其中甲烷占60～70％,其它为二氧化碳和
In the ponds, sludge ponds and cesspit surface, often a lot of bubbles, if slightly stirred more bubbles, if you use the fire to point the bubbles can burn, this burning gas is biogas. Biogas is widely found in nature. Any organic substance (man, livestock excrement, crop straw, etc.) can be biogas produced by the fermentation and decomposition of anaerobic bacteria under certain humidity, temperature and confined conditions. Its chemical properties are extremely stable, insoluble in water and lighter than air. Biogas is a mixture of gases, with methane accounting for 60-70% and carbon dioxide and others