One of the mysteries of the English language finally explained.
A liquid hydrocarbon present in petroleum. It serves as a standard in the system of octane numbers.
- ‘The isooctane used was of spectroscopic grade.’
- ‘They are rated based on their ability to resist knocking against a standard mixture of two hydrocarbons, isooctane and heptane.’
- ‘Mix gasoline with the right number of hydrocarbons and you get isooctane.’
- ‘The end result is the addition of isobutane to isobutylene to form isooctane, the molecule that is the basis of octane ratings seen at the gas pumps.’
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