• Methane
  • Methane (CH4) is a colorless, odorless, flammable, greenhouse gas. It is released naturally into the air from marshes, swamps, rice fields, ruminant animals (such as cattle), and sewage sludge. CH4 is also released from methane-producing bacteria (methanogens) that live in anaerobic places. [Solar Energy; v52n6; 467-477; 1994.] [Air, The Nature of Atmosphere and the Climate; Michael Allaby; pages 39,40; 1992; Facts on File; New York] [Dictionary of Science; R.K. Barnhart; page 398; 1986; Houghton Mifflin Company; Boston.]
Abstract from DBPedia
    Methane (US: /ˈmɛθeɪn/ MEH-thayn, UK: /ˈmiːθeɪn/ MEE-thayn) is a chemical compound with the chemical formula CH4 (one carbon atom bonded to four hydrogen atoms). It is a group-14 hydride, the simplest alkane, and the main constituent of natural gas. The relative abundance of methane on Earth makes it an economically attractive fuel, although capturing and storing it poses technical challenges due to its gaseous state under normal conditions for temperature and pressure. Naturally occurring methane is found both below ground and under the seafloor and is formed by both geological and biological processes. The largest reservoir of methane is under the seafloor in the form of methane clathrates. When methane reaches the surface and the atmosphere, it is known as atmospheric methane. The Earth's atmospheric methane concentration has increased by about 150% since 1750, and it accounts for 20% of the total radiative forcing from all of the long-lived and globally mixed greenhouse gases. It has also been detected on other planets, including Mars, which has implications for astrobiology research.

    メタン(独: Methan、英: methane)は、無色透明で無臭の気体(常温の場合)。天然ガスの主成分で、都市ガスに用いられている。メタンは最も単純な構造のアルカンで、1個の炭素原子に4個の水素原子が結合してできた炭化水素である。分子式は CH4。和名は沼気(しょうき)。CAS登録番号は [74-82-8]。カルバン (carbane) という組織名が提唱されたことがあるが、IUPAC命名法では非推奨である。


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