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Comment by boromi | Hacker News Reader

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Yes per volume gasoline is impressive.

You would need a tank 4 times the size of a gasoline tank for liquid hydrogen, not to mention the high pressure tank that is needed to store the liquid hydrogen .

How come fuel cell cars have tanks holding like 10kg of liquid hydrogen?

Because fuel cells are very efficient at turning fuel to electricity, especially compared to an ICE.

That's not ICE.

Nitpick: It's typically compressed hydrogen for cars.

Because hydrogen is the energy densest fuel by mass, but not by volume.

Do those comparisons take into account their respective engine technologies and how much useful work they are able to extract from each fuel in practice?

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