4 Answers
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Density of water becomes its greatest right before it freezes so as the ice is being formed it pushes and expands on the little liquid left. Liquid does not compress acts as a hydraulic piston building up pressure if pressure exceeds burst pressure of pipe will burst.
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When water freezes it expands, as opposed to practically all other liquids. (For this reason ice is less dense than water and it fortunately forms on the TOP of ponds and lakes.) The expansion causes pressure to build up that could eventually burst the pipe. However, most bursts occur in home water pipes because, as the ice builds up in the direction of the pipe, the water pressure continues to build up downstream from the growing volume of ice as water in this section of the pipe is being compressed, that is between the ice and the faucet(s). (Water pressure is not expected to build up significantly upstream as there is much more water on this side.) This enormous build-up of pressure can eventually cause the strongest of pipes to burst. It is a good idea to leave a faucet dripping if the pipe leading to it is in danger of freezing. Not only does this significantly reduce the chance of the water freezing in the pipe, but it keeps the water pressure from building up to dangerous levels that can cause bursting.
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The water inside the pipes, like all things that freeze. Expand. In doing so expanding the pipes sometimes to twice the normal size. So the ice has to go somewhere & the pipes is to small for it to stay there.
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it's a reaction caused by the collision of two extreme temeratures and, therefore, pressures. The metal that tubes are made of is warm cuz it's heated by the hot water within, and it becomes extremely fagile when exposed to rather cold air. So the tubes burst cuz the metal cannot bear the difference in inside/outside temperatures.
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Why do frozen water pipes burst?
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