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cetane number (CN)
The diesel fuel equivalent to a gasoline octane rating, this number expresses the fuel's ignition quality and its suitability for spontaneous self-ignition in an engine. The fuel must ignite spontaneously and quickly after being injected into the hot, compressed air inside the combustion chamber. A higher cetane number means a shorter ignition delay and a smaller amount of fuel in the combustion chamber when the fuel ignites.
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- Part of Speech: noun
- Synonym(s):
- Blossary:
- Industry/Domain: Automotive
- Category: Vehicle equipment
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