this post was submitted on 27 May 2026
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[–] pelya@lemmy.world 2 points 1 week ago (1 children)

Yeah I thought the same thing, but no. People who actually launch weather balloons swear off hydrogen like a plague, because apparently it explodes while you are filling the balloon.

[–] CanadaPlus@lemmy.sdf.org 4 points 1 week ago* (last edited 1 week ago)

That makes sense, although in wartime it would matter less. You can also generate it fairly portably with ferrosilicon and acid.

It's worth mentioning a football field or whatever of Mylar won't be free. Big balloons retail for hundreds on their own according to a quick search.