Natural gas
is a
gaseous fossil fuel consisting primarily of
methane but including significant quantities of
ethane,
butane,
propane,
carbon dioxide,
nitrogen,
helium and
hydrogen sulfide. It is found in
oil fields and
natural gas fields, and in
coal beds (as
coalbed methane). When methane-rich gases are produced by the
anaerobic decay of non-fossil
organic material, these are referred to as
biogas. Sources of biogas include
swamps,
marshes, and
landfills (see
landfill gas), as well as
sewage sludge and
manure by way of
anaerobic digesters, in addition to
enteric fermentation particularly in
cattle. Natural gas is often informally referred to as simply gas, especially when compared to other energy sources such as electricity. Before natural gas can be used as a fuel, it must undergo extensive
processing to remove almost all materials other than methane. The by-products of that processing include ethane, propane, butanes,
pentanes and higher molecular weight hydrocarbons, elemental sulfur, and sometimes
helium and nitrogen.
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Gaz naturel
Erdgas
Erdgas ist ein brennbares Naturgas, das in unterirdischen Lagerstätten vorkommt. Es tritt häufig zusammen mit
Erdöl auf, da es auf ähnliche Weise entsteht. Erdgase bestehen hauptsächlich aus Methan, unterscheiden sich aber in ihrer weiteren chemischen Zusammensetzung.
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Gaz ziemny
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Gas naturale
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