Pyrolysis, the chemical decomposition of organic (carbon-based) materials through the application of heat. Pyrolysis, which is also the first step in gasification and combustion, occurs in the absence or near absence of oxygen, and it is thus distinct from combustion (burning), which can take place only if sufficient oxygen is present. The rate of pyrolysis increases with temperature. In industrial applications the temperatures used are often 430 °C (about 800 °F) or higher.

Pyrolysis has numerous applications of interest to green technology. It is useful in extracting materials from goods such as vehicle tires, Waste Plastics, removing organic contaminants from soils and oily sludges, and creating biofuel from crops and waste products.

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