how does heat alone create fire?



how does heat alone create fire?

In: Physics

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*.

Heat alone doesn’t create fire. It takes heat, fuel, and oxygen. Take away any one of the three and no fire. Heat and oxygen are just what they say, fuel can be one of many many things. Depending on the amount of heat and oxygen, even steel can be the fuel.

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.