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natural gas
is a naturally occurring mixture of gaseous
saturated hydrocarbons, consisting
of 80-95% methane (CH4), lesser amounts of
propane, ethane
and butane, and small quantities of
non-hydrocarbon gases (e.g., nitrogen, helium). Natural gas is found in
sandstone, limestone,
and other porous rocks beneath the earth’s surface, often in association
with crude oil. Because of its high heating
value and clean-burning characteristics, natural gas is widely used as a
fuel. The heavier hydrocarbons in
natural gas can be extracted, through compression or absorption processes,
to yield LPG (propane or butane),
natural gasoline, and raw materials for
petrochemical manufacture.
Also see
gas
engine, natural gas liquids.
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- Analytical Almanac
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