3. Water to Ice: Investigation 11
What happens to weight and volume when water freezes?
3. Share findings
All Class 15 Mins
Have students contribute data to the class table: weight before freezing, the weight after freezing, and the volume after freezing (same, increased or decreased).
| Pair | Weight before Freezing (grams) | Weight after Freezing (grams) | Volume after Freezing (Notes) | Weight after Melting (grams) | Volume after Melting (Notes) |
|---|---|---|---|---|---|
| 1 | |||||
| 2 | |||||
| 3 | |||||
| etc. |
Why does the water expand when it freezes?:
In simplest terms, the tiny water particles rearrange themselves to form crystals when they freeze. In their new arrangement, the particles are not as tightly packed together as they are in liquid form and they take up more space.
