Answer Posted / vikas bhardwaj
Octane No.- Octane number is defined as the percentage, by
volume, of iso octane in the mixture of iso octane and h-
heptane. It is the measure of rating of SI engine.
Cetane No.-Cetane number is defined as the percentage, by
volume, of n-cetane in the mixture of n-cetane and alpha
methyl napthalene. It is the measure of rating of CI engine.
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