A liquid hydrocarbon present in petroleum. It serves as a standard in the system of octane numbers.
- 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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