4/25/2010
Sound and Heat Phase Changes
Water goes through phases as it heats up. T (ºC)
Q steammcsteam onlyT
100 waterQ mHand steamwater
Q watermc wateronlyT iceQ and mH water 0 ice
Qice onlymciceT
Q (J)
1
Sound and Heat Phase Changes
The steam and ice can coexist! http://www.enchantedlearning.com/subjects/volcano/glossary/indexp.shtml
2 If the pressure and temperature are just right!
1 4/25/2010
Sound and Heat Phase Changes
In fact all three (ice, water and steam) exist at the triple point!
3 If the pressure and temperature are just right!
Sound and Heat Phase Changes
There are many temperatures and pressures where ice, water and steam coexist!
4 Note: there are many kinds of ice!
2 4/25/2010
Sound and Heat Phase Changes
Some of the different kinds of ice… http://ergodic.ugr.es/termo/lecciones/water1.html
-3 a f h Dielectric constant, Ice polymorph Density, g cm Protons Crystal Symmetry i Notes eS
Hexagonal ice, Ih 0.92 disordered Hexagonal one C6 97.5
Cubic ice, Ic 0.92 disordered Cubic four C3 As prepared, may LDA b 0.94 disordered Non-crystalline be mixtures of several types As prepared, may HDA c 1.17 disordered Non-crystalline be mixtures of several types VHDA d 1.25 disordered Non-crystalline
II, Ice-two 1.17 ordered Rhombohedral one C3 3.66 protons may be III, Ice-three 1.14 disordered Tetragonal one C 117 4 partially ordered metastable in ice IV, Ice-four 1.27 disordered Rhombohedral one C 3 V phase space protons may be V, Ice-five 1.23 disordered Monoclinic one C 144 2 partially ordered protons can be VI, Ice-six 1.31 disordered Tetragonale one C 193 4 partly ordered two e VII, Ice-seven 1.50 disordered Cubic four C3 150 interpenetrating ice Ic frameworks low temperature VIII, Ice-eight 1.46 ordered Tetragonale one C 4 4 form of ice VII low temperature 5 IX, Ice-nine 1.16 ordered Tetragonal one C 3.74 4 form of ice III symmetric proton X, Ice-ten 2.51 symmetric Cubice four C 3 form of ice VII
3