Hydrogen, for rocket fuel, tends to leak even through metal containers. Launchers carry hydrogen cooled to liquid in order to save storage space for aerodynamical reasons, but that is unnecessary in free space. Hydrogen is the most efficient rocket fuel and needs to be stored in space during long travel times until for example a landing burn, or in the future maybe after having been extracted from airless celestial bodies.

Would hydrogen gas in inflated huge balloons leak less than liquified hydrogen in pressure tanks?

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    $\begingroup$ Since flow rate is roughly proportional to delta pressure, there may be some advantage, but there are a lot of factors to consider depending on your imagined system. For example, are your balloons more vulnerable to penetration by micrometorites, and will that make them leak more than if you left the h2 liquid? Will you have to recompress the H2 to use it in your engine? If not, your mass flow rate is likely to be very low and so will your thrust. Bottom line, without some kind of system design in mind, it's pretty impossible to say if this is advantageous. Maneuvering with huge balloons? $\endgroup$ – Organic Marble Dec 22 '15 at 14:15

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