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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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