What is essential for the occurrence of pyrolysis?

Pyrolysis is the thermal decomposition of materials at elevated temperatures in an inert atmosphere, which means that heating a material to a critical temperature is a key aspect of this process. This heat causes the breakdown of complex organic molecules into simpler molecules, which can lead to the production of flammable gases. It's the application of sufficient heat that initiates this chemical process, distinct from combustion, which requires an oxidizer.

In contrast, while a strong oxidizer may play a role in combustion scenarios, it is not necessary for pyrolysis itself. Cooling a fire does not contribute to the pyrolysis process, but rather to cessation of combustion. Regarding moisture, having a high moisture content in the material generally inhibits pyrolysis because the presence of water can absorb heat and raise the energy requirement for reaching critical temperatures. Thus, the necessity of heating a material to a critical temperature is fundamental for the occurrence of pyrolysis.