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Boeing's Starliner successfully docks with space station after challenging rendezvous (www.cbsnews.com)

submitted 11 months ago by [email protected] to c/[email protected]

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[–] [email protected] 2 points 10 months ago

helium is one of the hardest substances to contain, second only to hydrogen

I think helium is harder to contain. Although hydrogen is lighter atom, it is also a larger atom due to lower nuclear charge (Z effective). Hydrogen is also a diatomic molecule, whereas helium is a single atom. I think the only thing helium has going for it is that it doesn't easily dissolve in and embrittle metals. But helium can fit through any gap hydrogen can.