甲烷在空气中完全燃烧

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C{H}_{4}+2{O}_{2}\xlongequal{ ext{点燃}}C{O}_{2}+2{H}_{2}O \\ C{H}_{4}+2{O}_{2}\xrightarrow { ext{点燃}}C{O}_{2}+2{H}_{2}O \\ C{H}_{4（g）}+2{O}_{2（g）}\xrightarrow { ext{点燃}}C{O}_{2（g）}+2{H}_{2}{O}_{（l）}

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