Spy shots of a new BMW that runs on hydrogen have just been released. Back in 2004, BMW promised that they would have a hydrogen car ready in 4 years. Seems like they might keep their word (unlike GM and Ford.)
As far as I can tell, there is only one problem with his fine piece of German engineering (apart from the price): where do you buy the fuel? My local gas station doesn't even carry diesel, let alone explosive liquid hydrogen.
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It's a modified reciprocating internal combustion engine. Not nearly as sexy as fuel cells.
Is liquid hydrogen explosive? I would think you would need oxygen to support a runaway exothermic reaction. Even if the tank is not full, there should be sufficient evaporation to drive off atmospheric gases.