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Originally Posted by Kybosh
Also, people always talk about how explosive hydrogen is. . .well the gasoline you use in your car is more dangerous right now in terms of explosions and fire.
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True, but let's just add on more fact to that equation. Hydrogen and gasoline have one thing in common; neither of them burn in liquid form. Your car takes the liquid gasoline and sprays it to allow for faster evaporation so it can be ignited.
The difference being is that in a normal environment ( -30 to +30 Celcius and one atmosphere pressure) gasoline is a liquid. Under the same circumstances hydrogen becomes a gas. So your tank of 50 litres of liquid hydrogen instantly evaporates and becomes a deadly cloud of gas; killing anybody within several metres and then igniting very easily.
I may have over simplified this a little, but I think you get my point.