1. Heating Curve for Water
gas D
100 C
liquid
Temperature (oC)
Melting, freezing, vaporization, condensation, sublimation, and deposition are six common phase changes.
Note: The temperature of a substance does not change during a phase change. B A
solid
Heat added
LeMay Jr, Beall, Robblee, Brower, Chemistry Connections to Our Changing World , 1996, page 487

2. Heating Curve for Water
vaporization E
gas D
100
condensation C
liquid
melting
Temperature (oC)
Melting, freezing, vaporization, condensation, sublimation, and deposition are six common phase changes.
Note: The temperature of a substance does not change during a phase change. B A
freezing
solid
Heat added
LeMay Jr, Beall, Robblee, Brower, Chemistry Connections to Our Changing World , 1996, page 487

3. Latent Heat
Take 1 kg of water from –10 oC up to 150 oC we can plot temperature rise against absorbed heat
steam
(water vapor)
100 C
ice
water
0 C
-10 C
Lf = 80 cal/g
Lv = 540 cal/g
Q heat absorbed
Lf is the latent heat of fusion
Lv is the latent heat of vaporization