X-Message-Number: 3401
Subject: SCI.CRYONICS: High Pressure CRYONICS LN boiloff
From:  (Ben Best)
Date: Sun, 13 Nov 1994 03:58:00 -0500

   Brian Wowk is correct in saying that high pressure would raise,
rather than lower, boiling point temperature for liquid nitrogen.
I was thoughtlessly repeating a suggestion that someone else had
made.  Lowering pressure, however, would lower the boiling point
of liquid nitrogen. It would also add another level of costliness
and difficulty in storage, plus increase total boiloff in a given
period of time. Overall, it seems like a bad idea. Liquid helium
storage would definitely be colder (-269 Celcius) and could be
more economical, although I have no idea how much liquid helium
costs per litre?  I'd be curious to know -- can someone on the
Net provide this information?

                     -- Ben Best ()

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