Noun
cetane number (plural cetane numbers)
A performance rating of diesel fuel corresponding to the percentage of cetane in a mixture with isocetane (or, formerly, methylnaphthalene) that would have the same performance.
Requirements for fuels to be used in diesel engines are the ability of the fuel to flow along the fuel lines, the ability of the fuel to lubricate the injector pump and injectors adequately, and its ignition qualities (ignition delay, cetane number ). Source: Internet
The degree of branching affects characteristics, such as the octane number or cetane number in petroleum chemistry. Source: Internet