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Latest comment: 12 years ago1 comment1 person in discussion
Can anyone explain why the helium [is] used as a tracer gas?
Helium has the smallest "molecule" of any substance and is therefore the most likely to leak in any given situation. Helium is the smallest because it is monatomic, meaning it floats around as single, unbonded helium atoms, and out of all monatomic gases (inert gases), helium is the smallest. Hydrogen would have a smaller atom if it were unbonded, but hydrogen is diatomic, meaning it is composed of molecules having two hydrogen atoms, making it bigger than helium. H Padleckas (talk) 05:19, 15 March 2012 (UTC)Reply
