> Suppose you surrounded the" Hydrogengel "with a mylar bag?
That might work but not for very long. Air can diffuse through Mylar and helium
can diffuse out, that happens to blimps too but dealing with air contamination in
a gas bag is much easier than in a solid. I'm not sure but I suspect you'd have to
heat the aerogel in a vacuum oven every few weeks until it was incandescent to
drive the air out and then re-infuse the helium. Aerogel zeppelins would be heavier
than pure gas bags and so would have to be even bigger to get equal lift, putting a
monster like that into a vacuum oven 2 or 3 times a month doesn't seem practical.
By the way I'd use helium, I'd never use hydrogen in a oxygen atmosphere, it's
just too dangerous
John K Clark firstname.lastname@example.org
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