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الموقع : http://demo.ahlamontada.net/forum.htm
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تاريخ التسجيل : 22/03/2009
|موضوع: an article about ....Betrol or "gasoline الجمعة ديسمبر 04, 2009 9:34 pm|| |
Gasoline or petrol is
a liquid mixture
used as fuel in internal combustion engines. It is petroleum-derived,
and consists mostly of aliphatic hydrocarbons, enhanced with iso-octane
or the aromatic hydrocarbons toluene and benzene to increase its octane
of hydrocarbons, although some may contain significant quantities of
ethanol and some may contain small quantities of additives such as
methyl tert-butyl ether as anti-knock agents to increase the octane
rating or as an oxygenate to reduce emissions. The hydrocarbons consist
of a mixture of n-paraffins, naphthenes, olefins and aromatics.
Naphthenes, olefins and aromatics increase the octane rating of the
gasoline whereas the n-paraffins have the opposite effect.
Most current or former Commonwealth countries use the term "petrol", abbreviated
from petroleum spirit. In North America, the word "gasoline" is the
common term, where it is often shortened in colloquial usage to simply
"gas." It is not a genuinely gaseous fuel (unlike, for example,
liquefied petroleum gas, which is stored under pressure as a liquid,
but returned to a gaseous state before combustion). The term
petrogasoline is also used.
In aviation, mogas, short for
motor gasoline, is used to distinguish automobile fuel from aviation
gasoline, or avgas. In British English, "gasoline" can refer to a different petroleum derivative historically used in lamps, but this usage is relatively uncommon.