When water freezes its density?

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Water at ordinary temperatures contracts and increases in density as it is cooled, like most substances. But at about 4&deg;C it reaches a maximum
density and then decreases in density as it approaches the freezing point.

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Above 4 degrees C, warm water floats on cold. Below 4 C cold water floats on warm. That means that every fall when the temperature drops, all the lakes turn over, carrying oxygenated water to the bottom to support the fish during winter. In spring when the temperature rises, the lakes turn over again, carrying food to the surfact to feed the newly hatched insects, which the fish eat if they can catch them. If it were not for this property of water, all lakes would be lifeless ice at the bottom all the time.

"Floats" means lower density. There is another more significant reduction of density when water freezes: ice breaks things.

When water freezes its density?

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