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Hi Rick,

Thanks for the input.  As for helium rising, my understanding is that,
because helium is lost (escapes earth's gravitational hold) at the outer
edge of the atmosphere, there is a lower concentration of it way up high. 
This establishes a declining concentration gradient with an increasing
altitude, so there is a slight net movement of helium upward by diffusion.
The same does not happen with nitrogen because it is massive enough/not
energetic enough to escape earth's gravity.

Of course, I may be WAY off base on this one, but it seems to make sense

Aloha,
Rich
deepreef@bi*.bi*.ha*.or*

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