Methane

Definition and meaning of Methane in chemistry.

Methane is the simplest alkane and the main constituent of natural gas, characterized by a single carbon atom covalently bonded to four hydrogen atoms. It is a potent greenhouse gas that remains colorless, odorless, and highly flammable under standard temperature and pressure conditions.

In more detail

The methane molecule features a symmetrical tetrahedral geometry with bond angles of exactly 109.5 degrees, resulting from the sp3 hybridization of its central carbon atom. It is produced naturally on Earth through methanogenesis, a biological process in which anaerobic microorganisms called archaea decompose organic matter in oxygen-depleted environments like wetlands, the digestive tracts of ruminants, and deep ocean floor clathrates. Industrially, methane is extracted directly from deep geological deposits alongside other fossil fuels and is primarily used for residential heating, large-scale electricity generation, and as a chemical feedstock for producing hydrogen gas via steam-methane reforming. It can also react with halogens under ultraviolet light in free-radical substitution reactions to form commercially useful halomethanes like chloromethane or dichloromethane. While it has a shorter atmospheric lifespan than carbon dioxide, its global warming potential is over 28 times greater across a 100-year period, making anthropogenic methane mitigation a major focus of international climate change policy.