瓦斯，又名沼气，化学名称叫甲烷。它是一种无色、无臭。无味、易燃、易爆的气体。如果空气中瓦斯的浓度在5.5%上16%时，有明火的情况下就能发生爆炸。瓦斯爆炸会产生高温、高压、冲击波，并放出有毒气体。

　　现场救护：

　　当听到或看到瓦斯爆炸时，应面背爆炸地点迅速卧倒，如眼前有水，应俯卧或侧卧于水中，并用湿毛巾捂住鼻口。距离爆炸中心较近的作业人员，在采取上述自救措施后，迅速撤离现场，防止二次爆炸的发生。

　　瓦斯爆炸后，应立即切断通往事故地点的一切电源，马上恢复通风，设法扑灭各种明火和残留火，以防再次引起爆炸。所有生存人员在事故发生后，应统一、镇定地撤离危险区。遇有一氧化碳中毒者，应及时将其转移到通风良好的安全地区。如有心跳、呼吸停止，立即在安全处进行人工心肺复苏，不要延误抢救时机。

　　怎样预防井下瓦斯爆炸呢?

　　要加强井下通风，采用各种通风措施，保证井下瓦斯不超过规定含量，严格检查制度，低瓦斯井下每班至少检查2次，高瓦斯矿井中每班至少检查3次，发现有害气体超过规定，应及时采取封闭等必要措施。每个矿工应注意，在下井时，严禁携带烟蒂和点火物品，不要使用电炉和灯泡取暖。

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