Hewitt Drew-It! PHYSICS Screencasts
Temperature, Heat, and Expansion

71. Heat and Temperature
Heat and Temperature are defined and distinguished.

72. Specific Heat
The "thermal inertia" of substances is explained, particularly water.

73. Thermal Expansion of solids
Expansion of solids, bimetallic strip, and ring around the Earth.

74. Thermal Expansion of Water.
Densest water at 4C explained, with classroom video of ice formation.