> Dumb idea time... Could I obtain hydrogen and helium by making a 
> sealed
> steel container, creating a good vacuum in it, and waiting for it to
> fill up with hydrogen and helium from the atmosphere? How pure would 
> it
> be?

Definitely impractical, but fun.

You'd get Hydrogen, not Helium.And, given the vanishingly small 
(literally) amount in the atmosphere you'd get  about none over any 
sensible time period. But a fun game :-).


        Russell


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