(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.
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
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.
[ok-tang-guh l] /ˈɒk tæŋ gəl/ adjective 1. . noun 2. . /ˈɒktæŋɡəl/ noun 1. a less common name for octagon
[ok-tang-gyuh-ler] /ɒkˈtæŋ gyə lər/ adjective 1. having eight angles. /ɒkˈtæŋɡjʊlə/ adjective 1. having eight angles
[ok-tuh-noh-ik, ok-] /ˈɒk təˈnoʊ ɪk, ˌɒk-/ noun, Chemistry. 1. .
[ok-tanz] /ˈɒk tænz/ noun, genitive Octantis [ok-tan-tis] /ɒkˈtæn tɪs/ (Show IPA). Astronomy. 1. the Octant, a southern constellation that contains the south celestial pole. [ok-tuh n] /ˈɒk tən/ adjective 1. (of a fever) occurring every eighth day. noun 2. an octan fever. /ˈɒktænz/ noun (Latin genitive) Octantis (ɒkˈtæntɪs) 1. a faint constellation in the S […]