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Is there a known gas that would combust by there mere action of mixing with oxygen? So, we could put this hypothetical gas in a balloon, and if the balloon popped, it would combust and explode.

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    $\begingroup$ Phosphine - PH3 $\endgroup$ – Waylander Oct 16 '18 at 21:41
  • $\begingroup$ Well, any pyrophoric gas would do. Phosphine is just one of them. $\endgroup$ – Jon Custer Oct 16 '18 at 21:49
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    $\begingroup$ @user69077 Phosphine, silane, borane. $\endgroup$ – A.K. Oct 16 '18 at 21:58
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    $\begingroup$ Disilane is way more exciting than silane. $\endgroup$ – Jon Custer Oct 16 '18 at 22:03
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    $\begingroup$ Dichlorosilane will go too $\endgroup$ – Waylander Oct 16 '18 at 22:04
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Edit: Many gasses have this capability, called pyrophoric gasses. These include Phosphine, silane, borane, and more

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    $\begingroup$ Note that phosphine is not an element, it is a molecule. $\endgroup$ – Jon Custer Oct 16 '18 at 21:50
  • $\begingroup$ To nitpick phosphine isn't an "element" but rather a "compound." $\endgroup$ – MaxW Oct 16 '18 at 21:51
  • $\begingroup$ Thank you, I didn't realize I had put element. $\endgroup$ – Connor Milligan Oct 16 '18 at 21:52

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