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Friday, October 31

Floating ice

Most subtances enlarge or expand as they heat up, and becomes smaller or contract as they get colder. But water is unusual. It contracts as it cools down to 4 0C. Then, as it gets even colder and freezes into ice, it expands again. This means a lump of ice at 00C weighs less than the same sized lump of water at 100C. So ice from an ice cube in a drink to a giant iceberg in the ocean- floats on water.


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