Isn't 0.25 bar a vacuum?
Quote:
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The ideal altitudes to transport hydrogen with balloons are 10 km or lower, and hydrogen pressures in the balloon vary from 0.25 to 1 bar.
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I'm in favor.
A prolate spheroid tensegrity shell, for a rigid airship, with a hydrogen bladder suspended inside. The hydrogen would be hot at ~1 bar, and the intervening space would have pure steam. It has lift approximating helium's but modulating the heat would give vertical control authority.
The steam would also maintain the temperature of the hydrgen (in it's graphene bladder).