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the higher self ignition temperature of the petrol is due to the low density than the diesel.

as

density = pressure / (R* temperature)

R= universal gas constant.

ex. hydrogen (gas) has density = .082 at 300 k

while kerosene has =810

(both are in kg/m^3)

and auto ignition temperatures are

hydrogen =500

kreosene=295

similarly , petrol-density=737

diesel has=820 to 950 .

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