At 03:39 PM 9/20/2011, Don Latham wrote...
Long ago and far away, I recall a friend using a gas that had its
liquid/gaseous transition near room temperature and was inert (not an
inert gas) to pressurize a vessel having high impedance circuits in
it.
I'm darned if I can remember what it was. Available in so-called "lab
bottles" ie not monster cylinders.
Trichlorofluoromethane (R-11, CFC-11) has a boiling point of ~24C. It
is available (although not manufactured, and most commonly in 100 lb
cylinders), but is the worst of the "Freons" with regard to ozone
depletion.
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