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Glossary:Natural gas
Methane, CH4.
Natural Gas is the portion of petroleum that exists either in the gaseous phase or is in solution in crude oil in natural underground reservoirs, and which is gaseous at atmospheric conditions of pressure and temperature. Natural Gas may include amounts of non-hydrocarbons. (SPE)
Also
Natural gas is a naturally occurring and flammable hydrocarbon gas that is used for fuel. Its primary component is methane, but it can also contain ethane, propane, butane, and pentanes. Often, impurities including oxygen, hydrogen sulfide (H2S), nitrogen, water, and carbon dioxide (CO2) are also present.[1]