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It is explosive only when mixed with enough oxygen, much like gasoline or propane. Hindenburg did not explode, it burned (quite fast, I should add).

As I understand, If you make a hole in hydrogen tank and set it on fire, it will just burn (don't try to do this at home).

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> If you make a hole in hydrogen tank and set it on fire

Right, the issue is though that in a collision you won't always just have a nice small controlled hole and burn.

I've worked around Hydrogen before, and storage was always a tricky issue. I remember the regulations stating something like needing to store the tank with either Argon or Nitrogen beside it. Not really something I'd want in the back, or any part for that matter, of my car.

Sorry, my bad, I misunderstood what you meant.

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