REALLY ? - try filling a balloon with H2 & one with CH4 at the same pressure - gas laws & all that stuff - see which one goes down (deflates) fastest even though the pressure of the H2 filled balloon has hugely reduce pressure as it deflates.
Clue - the pore size i.e. porosity of the balloons is the same i.e. the same.
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Ann: Very High Helium Concentrations Found at Ramsay 2, page-60
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