Octane Number 4
Octane Number 4 : The octane number of a gasoline is a measure of its anti-knock value. The higher the octane number, the higher the anti-knock quality of the gasoline. This quality is determined in a standard engine by matching for detonation the gasoline under test against a mixture of iso-octane and normal heptane, both pure hydrocarbons, the percentage by volume of iso-octane in that mixture being noted as the octane number
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