| Definition of Internal Energy | |
| Movie | |
| Definition of Thermal Energy | |
| Movie | |
| Thermal Energy Transfer 1 - Thermal Contact | |
| Movie | |
| Thermal Energy Transfer 2 - Thermal Equilibrium (note: incorrect use of the word heat) | |
| Movie | |
| Thermal Energy Transfer 3 (note: incorrect use of the word heat) | |
| Movie | |
| Ice Melting in Air | |
| Movie | |
| Water: Liquid and Solid Models | |
| Picture | |
| Water: Expansion and Contraction Graph | |
| Picture | |
