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'''Gasoline''' or '''gas''' ([[North America]]) or '''petrol''' ([[Commonwealth of Nations|Commonwealth]] countries) is a [[fuel]] derived from [[petroleum]], which is in turn generally thought to be derived from ancient vegetable matter. Gasoline is an aliphatic hydrocarbon, or the molecules are composed of nothing but hydrogen and carbon in long chains. The energy contained in a gallon of gasoline is approximately 132x10⁶ joules of [[energy]], equivalent to 125,000 [[BTU]] or 36,650 [[watt-hours]].<ref>[http://cta.ornl.gov/data/appendix_b.shtml US Department of Energy]</ref> This high energy density allows for much of the modern industry and comforts of the modern world through the transportation of goods and people.