In cold countries in winter water pipe cracks at below 0° Celsius
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The main reason is pressure. Water under pressure does not freeze at 0℃/32℉ and, depending on the amount of pressure, it can stay liquid at below freezing temperatures. This phenomenon is called .
Of course, there are a number of factors* that come into play and therefore people have to take some measures to prevent freezing in certain places. For example, an exposed garden faucet, which will freeze if not shut off and properly winterized (usually meaning drained and left partially open to prevent the liquid in it from cracking the pipes). Other measures taken are what mentions in his answer, which vary depending on the local conditions. Pressure by itself cannot prevent wanter from freezing all the time. In some cases the pressure required to keep water liquid would destroy the pipes in most homes.
Examples of supercooled water in nature are sea water in the arctic/antartic which allow aquatic mammals to maintain breathing holes in the ice. Clouds contain tiny droplets of supercooled water and it is believed that supercooled water seeps through crevices deep under the ice in glaciers and is partially responsible for the flow of the ice. The supercooled water acts as a lubricant between the ice above it and the ground or other ice below it, causing the upper layer of ice to slide out.
Of course, there are a number of factors* that come into play and therefore people have to take some measures to prevent freezing in certain places. For example, an exposed garden faucet, which will freeze if not shut off and properly winterized (usually meaning drained and left partially open to prevent the liquid in it from cracking the pipes). Other measures taken are what mentions in his answer, which vary depending on the local conditions. Pressure by itself cannot prevent wanter from freezing all the time. In some cases the pressure required to keep water liquid would destroy the pipes in most homes.
Examples of supercooled water in nature are sea water in the arctic/antartic which allow aquatic mammals to maintain breathing holes in the ice. Clouds contain tiny droplets of supercooled water and it is believed that supercooled water seeps through crevices deep under the ice in glaciers and is partially responsible for the flow of the ice. The supercooled water acts as a lubricant between the ice above it and the ground or other ice below it, causing the upper layer of ice to slide out.
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