>> Interesting. I was under the impression that *all* noble gasses are
>> extremely rare...
> 
> 1% of the atmosphere or so. It's used in a lot of places because it's not so
> rare. Often used in fire-extinguishing systems for server rooms

Well, gold is extremely rare, but if you have the cash there's no 
problem with buying some. ;-)

1% of air is certainly a vastly higher figure than I had imagined though.

I know they use Ar for arc welding and such. But the fire extinguisher 
for my server room is CO2. ;-)

-- 
http://blog.orphi.me.uk/
http://www.zazzle.com/MathematicalOrchid*

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