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Originally Posted by homealone
most substances shrink when they freeze & become more dense, as they cool.
- water becomes more dense as it cools until it reaches about 4°C, when it starts to become less dense - if this didn't happen, ice wouldn't float - and the water expands as it freezes, too.
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I believe this is because gasses become less soluable as the water becomes more solid (colder), hence why you can get bubbles in ice cubes