Does Water Expand When It Freezes?

The video explains why water expands when it freezes, due to its unique molecular structure. Water molecules form a crystalline lattice at freezing point, increasing volume and decreasing density, allowing ice to float. This phenomenon is crucial for aquatic ecosystems, preventing bodies of water from freezing solid and supporting life.

What is the significance of water's high heat capacity and surface tension?

How do intermolecular forces change as water cools, and what effect does this have on its density?