Well, not exactly. Octane and Cetane are not truly substances found in
gasoline or diesel fuel. Rather, the octane number (ON) or cetane number
(CN) are index numbers used to specify the resistance of the fuel to
knocking in an engine as it pertains to octane, or the igntion quality of
diesel fuel as it pertains to cetane.
The system was derived by ASTM (American Society of Testing and Materials)
to qualitatively specify the properties of these fuels
Hope this helps!
I "guess" we are referring to the same thing although your post didn't make
that clear to me when I first read it.. You said diesel "has" cetane while
gasoline "has" octane and that they are "products" which implied that they
are truly substances within the fuel. They are not, they are ratings.
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