One of the mysteries of the English language finally explained.
A figure indicating the antiknock properties of a fuel, based on a comparison with a mixture of isooctane and heptane.
- ‘Pyrolysis oil can also be added to gasoline to increase its octane rating.’
- ‘The higher the octane number you see on a gas pump, the more the fuel can be compressed before it explodes.’
- ‘However, ethanol has a good octane rating of around 112 and a high heat-off evaporation so it cools down the intake charge.’
- ‘In particular, the formation of branched alkanes increases the octane number and combustibility of the resulting hydrocarbon.’
- ‘Using a fuel of a higher octane rating than that recommended for your car doesn't improve its performance.’
octane number/ˈäkˌtān ˌnəmbər/
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