Question

Why a can full of kerosene oil does not catch fire on its own?

Answer 1

A substance will not catch fire if it does not reach its ignition temperature.
Combustible substances need availability of oxygen as well as the right amount of heat in order to combust.
even though kerosene[liquid fuel] is having low ignition temeprature, without heat energy it can't catch fire by itself.

Answer 2

kerosene and sodium are ex- of substance which catches spontaneous combustion (starts burning by itself) with the contact of heat of Sun, and low ignition temperature


so when it is inside the can it has no contact with Sun and doesn't burn