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:''For the biological process, see decomposition. '' Thermal decomposition, or thermolysis, is a chemical decomposition caused by heat. The decomposition temperature of a substance is the temperature at which the substance chemically decomposes. The reaction is usually endothermic as heat is required to break chemical bonds in the compound undergoing decomposition. If decomposition is sufficiently exothermic, a positive feedback loop is created producing thermal runaway and possibly an explosion. ==Examples== *Calcium carbonate (limestone or chalk) decomposes into calcium oxide and carbon dioxide when heated. The chemical reaction is as follows: ::CaCO3 → CaO + CO2 :The reaction is used to make quick lime, which is an industrially important product. *Some oxides, especially of weakly electropositive metals decompose when heated to high enough temperatures. A classical example is the decomposition of mercuric oxide to give oxygen and mercury metal. The reaction was used by Joseph Priestley to prepare samples of gaseous oxygen for the first time. *When water is heated to well over 2000 °C, a small percentage of it will decompose into OH, monotomic oxygen, monotomic hydrogen, O2, and H2.〔“Hydrogen production by direct solar thermal decomposition of water, possibilities for improvement of process efficiency.” (). Available: http://www.sciencedirect.com.ezproxy.lib.utah.edu/science/article/pii/S0360319904000928. (07-Jul-2015 ).〕 *The compound with the highest known decomposition temperature is carbon monoxide at ≈3870 °C (≈7000 °F).. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「thermal decomposition」の詳細全文を読む スポンサード リンク
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