Nathan B. answered • 05/28/18
Tutor
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Elementary and Algebraic skilled
Water molecules, when they freeze, tend to stick together in a hexagonal form. (Hence why snowflakes end up with six sides.) By doing so, they create a small pocket of space in the center, though. That's why when water freezes, it expands. Same mass but with greater volume means that ice is less dense than liquid water. It's also why ice floats to the surface in a glass of water.
