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Almost no liquids do that. Almost all become more dense when they freeze.

Water is a startling exception. Water is one of the only known substances

whose solid form floats in its liquid form.

When water freezes, it forms crystals which occupy more space than its molecules

would if they were packed together. That's because of the special shape of the

water molecule, and the hydrogen bonds that it forms with other water molecules.

The shape tends to form an open crystalline structure as the temperature drops

below 4 degrees Celsius. By the time it freezes, it's about 9% less dense than water.

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14y ago

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