* Density: Water is denser than ice. This means that in the same volume, water packs more molecules together.
* Expansion on Freezing: When water freezes into ice, the molecules arrange themselves into a more open, crystalline structure. This structure takes up more space, leading to a decrease in density.
In summary: While the mass of water and ice will be the same (since they are the same substance), the volume of ice will be larger due to its lower density. This means a liter of ice will have fewer water molecules than a liter of water.
