DEFINE OCTANE NUMBER ?

OCTANE NUMBER

The octane number of a fuel may be defined as the percentage by volume of is-octane in a mixture of iso-octane and normal heptane, which shows the same tendency to knock as the fuel, when tested in a specified type of engine under specified operating conditions. Thus an octane rating of 72 means that the fuel has the same knocking tendency as a mixture of 72% iso-octane and 28% normal heptane. 

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