cetane number

noun
a measure of the ignition quality of a diesel engine fuel by comparison with various mixtures in which the alpha form of methylnaphthalene is given a standard value of 0 and cetane is given a standard value of 100.
Also called cetane rating.


Origin:
1930–35

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cetane number
 
n
Compare octane number Also called: cetane rating a measure of the quality of a diesel fuel expressed as the percentage of cetane in a mixture of cetane and 1-methylnapthalene of the same quality as the given fuel

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Example sentences
The cetane index is derived from a formula for estimating the cetane number of
  diesel fuel.
Important characteristics of diesel fuels are its viscosity, pour point, and
  cetane number.
The cetane number of liquid products showed similar results.
SG is generally correlated against performance indicators such as cetane number
  and heating value.
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