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TWRoO said:
Kynes said:
Hydrogen is a highly reactive gas. It burns as soon it's in contact with oxygen, look at the Fukushima explosions. The heat dissociated the water onto oxygen and hydrogen, and it burned in a very violent explosion. It's much more instable than petrol.

Surely it won't burn if it is simply released into the air?, it needs a spark/flame or to be in extreme heat.

Years ago when I worked at the welding gas warehouse we carried a few bottles of compressed Hydrogen and (from what I remember) it is one of the only gasses which will react (almost) immediately without the need of a spark or flame ...

With that said, hydrogen fuel cells are designed to operate without storing any hydrogen which should be relatively safe.