For Octane Number we have terms and definitions in 5 topics. The topics are Automotive, Car Care, Energy, Explosives and Oil Acronyms.

Octane Number (Automotive)

Indicators of the antiknock value of a gasoline.

Octane Number (Car Care)

A term numerically indicating the relative antiknock value of a gasoline. For octane numbers 100 or below, it is based upon a comparison with the reference fuels isooctane (100 octane number) and n-heptane (0 octane number). The octane number of an unknown fuel is the percent by volume of isooctane with n-heptane which matches the unknown fuel in knocking tendencies under a specified set of conditions. Above 100, the octane number of a fuel is based on the engine rating, in terms of milliliters of tetraethyllead in isooctane which matches that of the unknown fuel.

Octane Number (Energy)

A measure of the resistance of a fuel to pre-ignition ("knock") when burned in an internal combustion engine. The higher the number, the more anti-knock quality.

Octane Number (Explosives)

Octane number, a quality rating for Gasoline indicating the ability of the fuel to resist premature detonation and to burn evenly when exposed to heat and pressure in an Internal Combustion Engine. Premature detonation, indicated by knocking and pinging noises, wastes fuel and may cause engine damage. The octane number can be increased by varying the relative amounts of the different Hydrocarbons that make up the gasoline or by additives, e.g., tetraethyl lead. Federal regulations in the U.S. require commercial gasoline pumps to indicate the octane number, which is usually 87 or 89 for regular grade gasoline and 93 for premium grade. Since the early 1970s most Automobiles have been built to operate on low octane gasoline with little or no lead added.

Octane Number (Oil Acronyms)

A measure of the detonation quality of gasoline. The higher the octane number, the higher the resistance to engine knock.

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