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octane number

   Also found in: Medical, Legal, Financial, Encyclopedia, Wikipedia 0.01 sec.
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.
octane number, rating
n
(Chemistry) a measure of the quality of a petrol expressed as the percentage of isooctane in a mixture of isooctane and n-heptane that gives a fuel with the same antiknock qualities as the given petrol
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.
ThesaurusLegend:  Synonyms Related Words Antonyms
Noun1.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
Translations
octane number, octane rating
n → Oktanzahl f
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The octane rating unit can be set up for either ASTM([R]) D 2699 (ISO 5164) (IP237) Standard Test Method for Research Octane Number (RON) or ASTM D2700 (ISO 5163) (IP236) Standard Test Method for Motor Octane Number (MON).
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The Molex unit uses UOP's Molecular Sieve technology to extract and recycle normal paraffins and further increase the product octane number.
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