A chemical decomposition caused by heat is termed as Thermal decomposition or Thermolysis. In other words Thermal decomposition is the breaking down of a chemical compound, caused by heat. It is a chemical change, as opposed to the physical changes that occur in melting and boiling. The reaction products are different substances. The temperature at which the substance chemically decomposes is a decomposition temperature of a substance. The reaction is generally endothermic as heat is required to break chemical bonds in the compound undergoing decomposition. If decomposition is adequately exothermic, a positive feedback loop is created producing thermal runaway and possibly an explosion. A thermal decomposition may be reversible or irreversible reaction.
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