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Since I make a living doing things with chemicals I will shed some light on
the gas issue.  In reality if you wanted a more optimum fill gas argon
would actually be a better choice from the standpoint of heat transfer (its
heat transfer is at least twice that of nitrogen or air)-hence its use in
some of the newer double pane windows...Unfortunately argon and its cousins
are monatomic (one atom) and their diffusion through membranes (tires,
o-rings, etc.) is fairly rapid, relatively speaking.  Its also a little
more expensive and harder to find.  Nitrogen is of course diatomic and a
larger molecule that behaves mostly like air except without the oxidative
qualities-causes other materials to decay faster..I hope this has put to
rest the gas issue...


[Not to be a nit-picker, but the heat transfer capability of Ar is 1/2 that
of Nitrogen... at least that's what 20 years in the insulated glass
business has taught me.  I imagine that was a typo <g>.  However...
"I hope this has put to rest the gas issue..."   Amen, brother.

  <Marv>    ]

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