It is the unit or scale which is used to measure the quality of fuel on the basis of anti-knocking property of internal combustion engine. It is defined as the percentage of iso-octane by volume in the mixture of iso-octane and n-heptane which has same anti-knocking property.
n-heptane è CH3-CH2-CH2-CH2-CH2-CH2-CH2
octane no. = 0
low anti knocking property
iso-octane è CH3-C-CH2-C-CH3
Octane no. = 100
High anti-knocking property
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