Question

What is anamolous expansion?

Answer 1

Anomalous expansion of water: water has a unique property of anomalous expansion. When water is cooled from room temperature it first contracts in volume and becomes increasingly dense as do other liquids, but at 4° C water reaches its maximum density. On further cooling it starts expanding and become less dense

Answer 2

Anomalous Expansion of Water: A common trend seen in substances through out, is the fact that all substances expand when they are heated and their density decreases and vice versa and when you cool something, it contracts and increases in density.