The process of spontaneous combustion is Spontaneous combustion is a phenomenon whereby a material ignites without the introduction of an external ignition source, such as a spark or flame. provide examples of materials or scenarios where this might occur.
1
Occurs without external ignition; examples include coal dust in mines and piled hay.
2
Needs high temperatures; common in industrial settings only.
3
Requires chemical catalysts; seen in laboratory environments.
4
Happens only with liquid fuels; such as petrol and diesel spills.