octane number

octane number

n.

A numerical representation of the antiknock properties of motor fuel, compared with a standard reference fuel, such as isooctane, which has an octane number of 100. Also called octane rating.

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octane number or rating

Noun

a number indicating the quality of a petrol

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octane number

A numerical representation of the ability of a fuel to resist knocking when ignited in the cylinder of an internal-combustion engine. The octane number of a given fuel is determined by comparing the amount of knocking that fuel causes when combusted with the amount of knocking caused by two standard reference fuels, isooctane (which resists knocking and has an octane number of 100) and heptane (which causes knocking and has an octane number of 0). The octane number is then assigned as the percentage of isooctane required in a blend with normal heptane to match the knocking behavior of the fuel being tested.

Thesaurus

Noun

1.

octane number - a measure of the antiknock properties of gasoline octane rating quantity, measure, amount - how much there is or how many there are of something that you can quantify