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This is a 200 bar Steel cylinder filled with air, that can survive 300C, Hydrogen cylinders proposed for cars would be 700Bar filled with Hydrogen that would catch fire suddenly easily, imagine 20l of petrol being sprayed over a flame over a 5 second period..
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Yet another ill informed posting designed to scaremonger by this OP.
There is no question that Hydrogen is highly inflammable, and it it were released en masse it would indeed be potentially lethal, but to even suggest that Hydrogen containment systems would be flimsy enough to fail catastrophically with little force is naive in the extreme.
The systems designed for fitting into cars would have to meet very stringent safety measures that would ensure they were very robust indeed.
The comparison with petrol is also very naive, Petrol is a liquid at normal temperatures, and even as a vapour it is still heavier than air so it will tend to collect at the lowest available point and pool. If it were to be set alight it will continue to burn for a relatively long time as the liquid will continue to vapourise and feed the flames until it has all be consumed. the same pooling issue arises for LPG which its wise not use LPG in areas that might retain any split vapour.
Safety is of course a concern, but If you consider that today, petrol is only contained in very flimsy plastic tanks, and LPG in pressure vessels, yet how many incidents of spilt petrol or LPG are there?
By comparison Hydrogen is the lightest gas we know of and it will quickly disperse into the atmosphere, and not collect like petrol would.
Don't be taken in by the continued misinformation the OP seems intent on spreading.