Physics - Fizik

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.