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The Octane Molecule

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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 isomeres, the isooctane (2,2,4-trimetylpentane) is especially important, because its octane rating is by definition 100. So 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.

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