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| ce·tane num·ber (plural ce·tane num·bers) or ce·tane rat·ing (plural ce·tane rat·ings) |
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| Definition: |
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measurement of diesel fuel ignition quality: the performance rating of a diesel fuel, expressed as the percentage of cetane in a mixture with 1-methylnaphthalene that shows the same ignition properties. The higher the cetane number, the better the performance.
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