Compare gasoline and diesel

The gasoline and diesel can be compared as follows:

Properties Gasoline (petrol ) Diesel
Knocking characteristics In a petrol engine, the combustion rate of air-petrol mixture initiated by sparking of spark plug becomes so fast that the mixture detonates producing metallic pinging sound knocking.

With a diesel engine, the combustion rate of air–diesel mixture initiated due to compression of air becomes very slow producing a loud sound known as knocking.

Octane number Octane number of given petrol under test is defined as the percentage by volume of iso-octane and n-heptanes which exactly matches the knocking characteristics of the petrol under test. Diesel oils having high octane number shows higher knocking characteristics.
Cetane number Petrol having high cetane number shows higher knocking characteristics. The cetane number of a given diesel under test is defined as the percentage by volume of cetane in a mixture of cetane and ∝-methyl naphthalene which exactly matches the knocking characteristics of the diesel under test. The cetane number of a given diesel under test is defined as the percentage by volume of cetane in a mixture of cetane and ∝-methyl naphthalene which exactly matches the knocking characteristics of the diesel under test.
Doping agents Doping agents used in petrol are tetraethyl lead (TEL), crest biphenyl phosphate etc to increase its octane number. Diesel oil is not blended.
Blending agents Petrol is blended with cracked and reformed gasoline, alcohols, benzene etc to increase its octane number. Diesel oils are not blended.

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