cetane number

Popular Terms
Measure of the ignition quality of diesel fuel; higher this number, the easier it is to start a standard (direct-injection) diesel engine. It denotes the percentage (by volume) of cetane (chemical name Hexadecane) in a combustible mixture (containing cetane and 1-methylnapthalene) whose ignition characteristics match those of the diesel fuel being tested. See also Octane number.


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