Question

Explain why water pipes often break when water in them freezes

Answer 1

When water freezes, it's molecule crystalize into an open hexagonal form, which takes up more space than when the molecule are in liquid form- that is, the water molecules expand as they freeze. As the ice expands, it pushes water toward the closed faucet
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Answer 2

This was an application of of anamalous behaviour of water.
The question u asked is an amazing fact of water.
Normally any liquid decrease volume on cooling and increase volume on heating.
But water increase its volume on cooling and decrease volume on heating.
As the pipe volume cannot be increased or decreased as volume of water increase the pipe breaks