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Octane is an organic chemical, specifically an alkane, with formula C8H18. (8 carbon alkene). Octane has many isomers. One of those isomers, isooctane (2,2,4-trimetylpentane), is especially important, because its octane rating is by definition 100. It is an important constituent of petrol (US:gasoline).
Octane ratings are ratings used to represent the anti-knock performance of petrol by giving the percentage of octane in an octane-heptane mixture that would have the same performance.
See also: cetane in diesel.
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methane |
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ethane |
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propane |
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butane |
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pentane |
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hexane | |||||||||||||||||||||
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heptane |
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octane |
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nonane |
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decane |
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undecane |
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