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pyrophoricity
A pyrophoric substance (from Greek ''πυροφόρος'', ''pyrophoros'', "fire-bearing") ignites spontaneously in air at or below 55 °C (130 °F).〔SEMI, standard F6-92, (''Guide for Secondary Containment of Hazardous Gas Piping Systems'' ), (as cited by ChemiCool.com )〕 Examples are iron sulfide and many reactive metals including uranium, when powdered or thinly sliced. Pyrophoric materials are often water-reactive as well and will ignite when they contact water or humid air. They can be handled safely in atmospheres of argon or (with a few exceptions) nitrogen. Most pyrophoric fires should be extinguished with a Class D fire extinguisher for burning metals.
==Uses==
The creation of sparks from metals is based on the pyrophoricity of small metal particles, and pyrophoric alloys are made for this purpose. This has certain uses: the sparking mechanisms in lighters and various toys, using ferrocerium; starting fires without matches, using a firesteel; the flintlock mechanism in firearms; and spark-testing ferrous metals.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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