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Quality of Petrol (Octane Number)1 Topic1 Quiz
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Topic Content:
- Meaning of Octane Rating
- The Octane Number of Some Hydrocarbons
- Use of Additives to Improve Octane Rating
Octane rating or octane number is the measure of the value of the performance of fuel for a combustion engine.
The rating depends on the percentage composition of branch-chain to straight-chain hydrocarbons in the fuel. Branch chain hydrocarbons perform better as fuel in engines and have a high octane rating.
High-grade petrol has an octane rating closer to 100 while low-grade petrol has an octane number around 0 . Low-grade petrol causes knocking of motor engines. This reduces the efficiency of the engine as well as shortens its life span.
Petrol containing a higher percentage of straight-chain hydrocarbons is more likely to knock an engine compared to petrol containing a higher percentage of branched-chain hydrocarbons.
Low-grade petrol: octane rating = 0
Heptane or n-heptane is the straight-chain alkane with the chemical formula
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