octane number rating

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• 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 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

• octane number — (of gasoline) a designation of antiknock quality, numerically equal to the percentage of isooctane by volume in a mixture of isooctane and normal heptane that matches the given gasoline in antiknock characteristics. Also called octane rating.… …   Universalium

• octane number — 1. A measure of petrol s resistance to pre ignition or pinking , which is the sound made by an engine when pre ignition occurs, particularly at low revs and high load. Two measures are used, for low speed and high speed pre ignition. ULSP in the… …   Petroleum refining glossary

• octane number — noun Date: 1931 a number that is used to measure the antiknock properties of a liquid motor fuel (as gasoline) with a higher number indicating a smaller likelihood of knocking called also octane rating compare cetane number …   New Collegiate Dictionary

• octane number — /ˈɒkteɪn nʌmbə/ (say oktayn numbuh) noun (of a grade of petrol) a designation of antiknock quality, numerically equal to the percentage of iso octane by volume in a mixture of iso octane and normal heptane that matches the given grade of petrol… …  

• octane number — (also octane rating) noun a figure indicating the anti knock properties of a fuel, based on a comparison with a mixture of isooctane and heptane …   English new terms dictionary

• octane number — noun a measure of the antiknock properties of gasoline • Syn: ↑octane rating • Hypernyms: ↑measure, ↑quantity, ↑amount …   Useful english dictionary

• research octane number — (RON) A fuel octane rating determined by the research octane test, one of many test procedures. Compare octane number …   Dictionary of automotive terms

• 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