When water freezes, energy is released. Conversely, energy is required to melt water by breaking the hydrogen bonds that hold water molecules in a crystalline structure known as ice. Duration: 9:22.

Interesting things occur when solutes are added to water. Freezing is inhibited and temperature decreases. Practical applications can be had from these properties. Duration: 4:37.

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Kai tests what happens to the boiling temperature of water when salt is added. Duration: 2:58.

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Like most materials, when water is heated it will expand. However, water has another unique property of occupying more space when it melts. Consequently, water is the most dense at 4 degrees Celsius. Duration: 9:17.