Q.

Pipelines in cold countries often burst in winter, because –

A. Water freezes and expands in its volume
B. Temperature of ice is less than that of water
C. Pipelines contract in their volume
D. Pipelines expand due to freezing
Answer» A. Water freezes and expands in its volume
Explanation: Water expands on freezing. When liquid water is cooled, it contracts like one would expect until a temperature of approximately 4 degrees Celsius is reached. After that, it expands slightly until it reaches the freezing point, and then when it freezes it expands by approximately 9%. The fact that water expands upon freezing causes icebergs to float.
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