> What you want is sulfur hexafluoride :) This stuff is real "molasses
> gas".
> It's about 5 times as dense as air, and it takes other stuff forever to
> diffuse through it. It's also completely non-toxic (well, other than it's
> not oxygen, so you could suffocate in it). OTOH, I do remeber the small
> lecture bottle of it we got at our lab to be kinda pricey...
We use this in the electricity industry. Very toxic if you get it to break
down. Very much heavier than air. Indoor sites must have oxygen detectors
below the floor. US EPA hates the stuff.
Foxy
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