Octane number

Octane number,

Definition of Octane number:

  1. Measure of the ignition quality of gas (gasoline or petrol). Higher this number, the less susceptible is the gas to knocking (explosion caused by its premature burning in the combustion chamber) when burnt in a standard (spark-ignition internal combustion) engine. Octane number denotes the percentage (by volume) of iso-octane (a type of octane) in a combustible mixture (containing iso-octane and normal-heptane) whose anti-knocking characteristics match those of the gas being tested. In the older vehicles, high octane numbers were achieved by adding lead tetraethyl to the gas (the leaded gas), a pollutant that contributes to lead poisoning (see Lead). In the newer vehicles, the same result is achieved by the engine design that increases turbulence in the combustion chamber, and/or by adding aromatic hydrocarbons (such as xylenes) and oxygenates (oxygen-containing compounds such as alcohols) to the gas (the unleaded gas). Also called Octane rating. See also cetane number.

  2. A figure indicating the antiknock properties of a fuel, based on a comparison with a mixture of isooctane and heptane.

How to use Octane number in a sentence?

  1. In particular, the formation of branched alkanes increases the octane number and combustibility of the resulting hydrocarbon.

Meaning of Octane number & Octane number Definition