On 2007-09-22 16:07:27 -0400, Keith Hughes said:

Actually, do a search on "triple point" and look at the phase diagram
for water. That gives a good graphical depiction of the
pressure/temperature/phase relationships.

That just shows the phase vs temperature, not the energy required to
get the substance to pass that critical temperature.

See
http://en.wikipedia.org/wiki/Thermodynamic_databases_for_pure_substances
and search for "Enthalpy change of phase transitions" for some
explanation of the heat energy required to change phases, with a
diagram for zinc. (Thanks, Brian, for reminding me of the term I
couldn't remember.)

And also think a bit: If the difference between 32 and 33 were so
easily crossed, you wouldn't see so much ice in your drink so long.

--
Jere Lull
Tanzer 28 #4 out of Tolchester, MD
Xan's new pages: http://web.mac.com/jerelull/iWeb/Xan/
Our BVI pages: http://homepage.mac.com/jerelull/BVI/