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| Iso-Octane / 2,2,4 trimethyl pentane(Upper) Octane no. 100 and n-heptane (Lower) Octane no. O |
Octane number rating of a gasoline is the percentage of iso-octane in a mixture of iso-octane and n-heptane, which matches the fuel under test in knocking characteristics.
Greater the octane number , greater the anti-knocking property of fuel.
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