- An indicator of a fuel’s ability to burn at a controlled rate at high temperatures and pressures without causing a detonation (very rapid burning or exploding). This number is expressed as a percentage by volume of iso-octane in a mixture with a normal heptane that has the same knocking characteristics as the fuel. Fuel with an 87 octane rating is a mixture of 87% iso-octane and 13% heptane. Also called the knock rating or the performance number when the octane rating is above 100.
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Octane rating — or octane number is a standard measure of the anti knock properties (i.e. the performance) of a motor or aviation fuel. The higher the octane number, the more compression the fuel can withstand before detonating. In broad terms, fuels with a… … Wikipedia
octane rating — noun a measure of the antiknock properties of gasoline • Syn: ↑octane number • Hypernyms: ↑measure, ↑quantity, ↑amount * * * noun see octane number * * * octane number or … Useful english dictionary
Octane rating — A number used to indicate gasoline s antiknock performance in motor vehicle engines. The two recognized laboratory engine test methods for determining the antiknock rating, i.e., octane rating, of gasolines are the Research method and the Motor … Energy terms
octane rating — noun see octane number … New Collegiate Dictionary
octane rating — see octane number … Dictionary of units of measurement
octane rating — See octagon number … Dictionary of automotive terms
octane number — ☆ octane number or octane rating n. a number representing the antiknock properties of a gasoline, fuel mixture, etc., determined by the percentage of isooctane that must be mixed with normal heptane to produce the knocking quality of the fuel… … English World dictionary
octane number — or octane rating a measure used to express the ability of gasoline to reduce engine knocking. Gasoline is a complex mixture of hydrocarbons: compounds containing hydrogen and carbon. Beginning chemistry students learn that octane is the… … Dictionary of units of measurement
Octane — For the gasoline rating system, see octane rating. For other uses, see Octane (disambiguation). Octane … Wikipedia
octane number — Every brand of gasoline has an octane rating or number which indicates its ability to resist knocking. When the numbers were first developed, the researchers found that normal heptane (a hydrocarbon) had almost no ability to resist knocking so… … Dictionary of automotive terms