爆炸的发生可能有多种原因 ,或因意外事故引起或人为造成。平时 ,消防队员经常遇到的爆炸都是由天然气、丙烷等可燃气体或液体遇火源被点燃所引起的 ,或是由粉尘、水蒸气甚至是第一次爆炸后产生的负压所造成的。一般来说 ,爆炸物在建筑建设、拆除旧房、开采矿产以及其他领域中 The explosion can occur for a variety of reasons, either as a result of an accident or as a man-made incident. Ordinarily, firefighters often encounter explosions caused by ignition of combustible gases such as natural gas, propane, or liquids in response to an ignition source, or by the negative pressure created by dust, water vapor or even the first explosion . In general, explosives in construction, demolition of old houses, mining and other areas