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Old Jan 07, 2013, 07:19 PM
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The key is filling it with pure hydrogen and not letting it get tainted with oxygen. It's the oxygen/hydrogen combo that gets explosive. Even so, it takes a good 50/50 mixture to get a respectable boom. You could probably get one or two percent oxygen and not worry though. There is another video somewhere that shows various percentages being ignited. Everyone who has ever taken a basic college chemistry class has also done this burn test as well. The pure hydrogen just has a flame at the bottom of the test tube where it meets the air, whereas the 50/50 mixture pops with a loud chirp.
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