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Originally posted by Max the Mug
Now some smart person is going to come in and tell me what that gas is, but I'll tell them it begins with 'H'. I though hydrogen, but feel free to embarass me.
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I think it's Helium, as it's totally unreactive and so there's no risk of the gas catching fire and exploding. Some of the earliest blimps here (the most famous example being the Hindenburg) were filled with Hydrogen, and as a result were prone to exploding, killing everyone inside.