[maximus@Nashville]

Boris, Did not my first sentence say "I think"? I made no claim that this is a statement of "fact". You are correct that hydrogen is a liquid if super cooled. The liquid hydrogen is pumped into the shuttle just before take-off. There is no provision to keep it cold once on board. If liquid hydrogen is allowed to warm up, it returns to its gaseous form. This is not a system that could work in automobiles with current technology. I suggest you read more carefully before you post a nasty reply.

[boris]

Hydrogen can be kept liquid for long periods--at a price. There are insulation systems such as "MLI" (Multi-Layer Insulation), for example (doesn't work well on Earth because it needs a vacuum between layers). Tanks known as "Dewars" (doo-ers, like the Scotch whisky) are used to hold liquid hydrogen on the ground. They tend to be heavy.

ALL long-term hydrogen storage systems require active refrigeration--which again is not a good choice on cars.

--Boris

[boris]

P.S. Your "I think" applied to the flashpoint of hydrogen. The rest of your statement is not modified by "I think".