What is rapid combustion and spontaneous combustion?

Rapid combustion is fast burning when a fuel ignites quickly with a flame. Spontaneous combustion is burning that starts on its own without an external flame due to self-heating.

Combustion is a chemical reaction with oxygen that releases heat and often light. Rapid combustion happens when a fuel gets enough heat and oxygen to burn quickly, like LPG on a stove or petrol in an engine. It has a clear ignition source and visible flame.

Spontaneous combustion starts without a spark or match. Materials like oily rags, coal heaps, or damp hay can slowly oxidize and build heat. If heat is trapped and reaches the ignition temperature, they catch fire on their own. Safety steps include ventilation, proper storage, and removing heat buildup.