易燃气体在空气中的燃烧极限
                           （体积百分含量的极限）
?                 气体名称             上限              下限
                              乙炔C2H2            2%               81%
                                 氢气  H2             4%               75%
                                 丙烷C3H8           2%               12%
                                丁烷C4H10          2%                9%
                                甲烷CH4             5%                14%
?
l??? 比较起来，乙炔和氢气的易燃含量极限非常宽，说明它们将在一个变化范围较大的情况下同空气（氧气）形成易爆混合物。

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