High Quality Content by WIKIPEDIA articles! Pyrolysis is the chemical decomposition of condensed substances by heating, that occurs spontaneously at high enough temperatures. The word is coined from the Greek-derived elements pyro "fire" and lysys "decomposition". Pyrolysis is a special case of thermolysis, and is most commonly used for organic materials, being then one of the processes involved in charring. The pyrolysis of wood, which starts above 300 °C, occurs for example in fires or when vegetation comes into contact with lava in volcanic eruptions. In general, pyrolysis of organic substances produces gas and liquid products and leaves a solid residue richer in carbon content. Extreme pyrolysis, which leaves mostly carbon as the residue, is called carbonization.

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