On 12 Jul 2002, Sean R. Lynch KG6CVV wrote:
> > ...Liquid hydrogen is halfway to being a
> > gas: light, quite compressible, very low viscosity ...
>
> Hmmm, is the definition of a liquid as being an incompressible fluid
> naive then...
No real liquid is truly incompressible. Even water compresses slightly.
Most liquids are much *less* compressible than gases. LH2 is borderline;
as I said, it's sort of halfway to being a gas.
> is it somwhat inappropriate to call it "liquid" hydrogen, or
> is there something funky going on with gas bubbles in the liquid that
> let us still call it a liquid even though it's compressible?
No gas bubbles are involved. It's just a liquid that differs more from
the ideal liquid than most liquids do. Nobody has thought it worthwhile
to invent a different category just for the sake of LH2 (and maybe the
other quantum fluids).
Henry Spencer
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