Why Does Ice Conjoin Together When Melting In an Insulated Water Bottle?
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The outermost layer of the ice that is exposed to air melts as it is exposed to heat. The areas between the ice cubes and within the ice cubes both remain below freezing.
As the ice melts, the water drips into the spaces between the cubes. At this point the temperature is below freezing, and it freezes again.
The ice coming out of your freezer is colder than 0 C, it’s whatever your temperature your freezer is. Typically -5 or so. Water freezes at 0. So if the pile of ice cubes is protected from room heat by the insulation, then as the outside of the cubes warms up, the cubes inside the pile are still below freezing and able to freeze any liquid water that contacts them, fusing the cubes together.
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