| A19-1 | Crystal model. |
| Purpose: | To demonstrate thermal expansion. |
| Description: | In a simple model of a crystalline solid, the atoms are held together in a regular array by forces that act like a set of springs connecting the atoms. When the temperature is increased, the average distance between the atoms increase, which leads to an expansion of the whole solid body. |
| References: | |
| Equipment: | Crystal model. |