why diesel burns earlier than petrol if we keep them in atmosphere, which one is high volatile?

Question

i want to know burning processes of petrol and diesel and which one burns earlier

Answer 1

Petrol is highly volatile, readily forming a heavy explosive vapour if left exposed to the air. Diesel, or kerosene, is not particularly volatile.

Answer 2

It's the fuel vapors that explode in the cylinder or ignite first in the air and gasoline vaporizes into the air a lot easier than diesel fuel. So gasoline is a more volatile fuel.