Question

Why are taps left dripping in sub-zero temperatures during winter?

Answer 1

Explanation:

1. The dripping taps will always create some space for expansion.
2. Thus, when water in the pipe freeze in sub-zero temperatures, due to this anomalous expansion, it expands.
3. This expanding water always finds space for expansion as the tap is dripping.
4. Thus, water pipes do not burst.