Have the children annotate their findings in their
Density is mass per unit volume, or the ratio of the amount of matter in an object compared to its volume, or simply put:
- Mass = the amount of "stuff"
- Weight = how heavy the "stuff" is (Weight is determined by the amount of gravitational pull on an object, which is a property of the mass of the planet the “stuff” is on. The greater the gravitational pull, the more the "stuff" weighs.)
- Density = how tightly packed the "stuff" is
- Volume = the area of space the "stuff" takes up
If we apply this information to the cups, the cup of water and the cup of ice have the same mass, i.e. amount of "stuff." Because they had the same amount of "stuff," they have the same weight.
The "stuff" (molecules) in water is more tightly packed than in ice, so water has greater density than ice. Don't let the fact that ice is a solid fool you!
As water freezes it expands. So, ice has more volume (it takes up more space, but has less density) than water.