I still have to do the calculations... lets see:
A car that burns only half a liter of diesel for a 30 mile commute to work & back would only need the equivalent of about two liters of liquid hydrogen to do the same thing. The published density of liquid hydrogen is about 0.07 grams/milliliter, which is 35 moles per liter. So a 2-liter LH2 tank would contain 70 moles of H2 and at standard temperature & pressure this would occupy a volume of 1712 liters, or 1.712 cubic meters. Not a heck of a lot. That is why I am suggesting that people could manufacture their own fuel for a hydrogen-burning version of the Volkswagon One Liter car. The hydrogen would not even have to be liquefied. A low maintenance pressurized H2 tank should do the trick!
Imagine owning a car that consumed so little fuel that you could make your own using a home solar-powered electrolyzer. You would never pay for gas again. Your government would not have to coddle middle-eastern dictators ever again. I think it is a fantastic idea.
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Re: Solar Hydrogen Conversion