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When a plastic bottle completely filled...

When a plastic bottle completely filled with water is kept in a freezer, it breaks. Why does this happen?

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(1) The temperature of air in the freezer ( deep freeze) compartment of a refrigerator is less thatn `0^(@)C `. ( 2) When a plastic bottle, completely filled with water, is kept in this compartment , the temperature of water falls below `4^(@)C` and the water expands. Even when water freezes and ice is formed, there is an increases in the volume . It exerts a large pressure on the sides of the bottle and hence the bottle is likely to break.
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