[megotmea7]

Also, Hydrogen dissipates much faster than gasoline (and isn't environmentally harmful), so in the event of a spill hydrogen is remarkeably more safe.

i was reading about a test one proposed hydrogen fuel tanks and they took a full one and shot a high velocity incinidary round at it and after the initial explosion of impact and slight combustion the gas escaped so quickly it put itself out and dissipated into the atmosphere befor any serious damage. correct me if im wrong but hydrogen is less dense than helium at one atmosphere