On Wed, 10 Jul 2002, Sander Pool wrote:
> ...I had no idea that hydrogen and deuterium behave that
> way, interesting! ...
Hydrogen, helium, and in alternate weeks :-) neon, are called the "quantum
fluids", and quantum effects strongly influence their behavior. Most
other gases have very stereotyped physical behavior, with only the scale
of the graphs changing -- if you express temperature in units of the gas's
critical temperature, and pressure ditto, the graphs are very nearly
identical for an enormous range of gases. But hydrogen and helium are
always special cases, way off to one side, and neon sometimes is.
(This thread has wandered rather far from ERPS stuff, and probably ought
to be curtailed here, but I thought this bit of lore was worth mention.)
Henry Spencer
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