rpw3@fortune.UUCP (01/11/84)
#R:mhuxm:-117400:fortune:8600007:000:1566
fortune!rpw3 Jan 11 05:57:00 1984
Please excuse the ancient reference, it was just the closest book I
could pull off a mechanical engineer's desk. Any good thermo text
should do equally well.
"Thermodynamics", John Francis Lee & Francis Weston Sears,
Addison-Wesley (1955) <<Library of Congress # 55-5030>>
(Second printing July 1956)
On pp.35ff, section 2-5 "p-vpT surfaces for real substances" the phase
diagrams (pressure-volume-Temperature vs. state) are given for typical
substances that contract on freezing (such as carbon dioxide) and those
that expand on freezing (such as water). Since there are four variables
to be shown in two dimensions, the diagrams tend to be perspective
drawings of a cutaway view of a solid that's been sliced weird. Still,
you can see what's going on. Fig 2-11 (page 39) shows the p-v-T "surface"
for water/ice, showing at least seven different forms of ice (from Ice I
to Ice VII, naturally) which can occur under various (mostly high) pressures.
The fun part is the broad ranges where multiple states can exist at the same
time, such as water/ice-VII (80-100 degrees C @ 22-24,000 atmospheres)
or ice-V/ice-VI (-40-0 C at about 6000 atm). Liquid doesn't seem to exist
under any conditions below about -23 C, so if (as I claimed in "ice skates")
skates work by compression-melting, they do it above -20 C.
I have not been able to find Kurt Vonnegut's Ice-IX except in "Cat's Cradle" :-)
Rob Warnock
UUCP: {sri-unix,amd70,hpda,harpo,ihnp4,allegra}!fortune!rpw3
DDD: (415)595-8444
USPS: Fortune Systems Corp, 101 Twin Dolphins Drive, Redwood City, CA 94065rpw3@fortune.UUCP (01/13/84)
#R:mhuxm:-117400:fortune:8600008:000:528 fortune!rpw3 Jan 12 20:19:00 1984 >>Can Ice 9 exist at reasonable pressures? >>-- >>Phil Ngai >>---------- Yes, if the pressure is of the right kind. In fact, it was first synthesized under extreme publisher pressure, the kind you find when you are seven months late with the next chapter of the book (you've already spent the advance). Oops! This isn't net.sf-lovers. Never mind..... Rob Warnock UUCP: {sri-unix,amd70,hpda,harpo,ihnp4,allegra}!fortune!rpw3 DDD: (415)595-8444 USPS: Fortune Systems Corp, 101 Twin Dolphins Drive, Redwood City, CA 94065