What chemical property makes this happens?Why cooking oil can get on fire?
cooking oil is vegetable oil and is just like any petroleum oil which is made of hydrogens and carbons and things that burn when they get oxygen.
When you heat cooking oil, the vapor pressure above the pan goes up, eventually you are vaporizing the oil itself at around 450 degrees and it mixes with oxygen from the air. If heating continues there is a flash point reached where the fuel (cooking oil) and oxygen reach ignition point.
It is very similar to where they spray diesel fuel , which is very similar to cooking oil, into a cylinder. When the fuel and air is compressed the temperature goes way up and the air-fuel mixture spontaneously combusts when it reaches ignition temperature
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