Everything has autoignition temperature. That is a temperature, at which a material or object, spontaneously ignites, without external source of ignition.
Like, for example wood, ignites at 250-300 ‘C or paper at 230 – 240’C
Imagine an object being in the oven, like a pizza. And you leave it there, at maximum temperature – it will burn. Add oxygen and slightly increase temperature – and you will have a fire, from heat alone.
If you put something more flammable in the oven, like oil. And assuming it’s an electric oven – it could easily go on fire, if it is too close to heating elements.
Like when you put bacon on the top shelf and you see little sparks, when grease bounces off the coils.
All chemical reactions happen faster when they’re hotter. In the presence of an oxidizer, any given substance has a temperature at which the oxidization will happen fast enough to start generating a self-sustaining reaction, creating ignition. By comparison, at room temperature, there are chemical pairs which meet and instantly (or nearly instantly) ignite; we refer to these combinations as *hypergolic*.
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