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Why is water more dense than liquid water?

Updated: 8/21/2019
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ShawnThomasgp1742

Lvl 1
6y ago

Best Answer

Water is strange stuff. The density of all water at the same temperature is the same.

But as water cools down it gets denser and denser and sinks down through warmer water.

But ... when water reaches 3.98 C it starts to get less dense again and rises through slightly warmer water

As result the water at the surface of a lake is lighter and colder than the liquid at depth. In that location it can reach 0 C and freeze. the ice formed is about 90% as dense as water and floats.

As a result the open bodies of water freeze from the top down not the bottom up.

This is convenient for fish who can continue to live in the water under the ice and not be frozen out to the surface of the ice accumulated at the bottom.

The physics of this are complex but it relates to the initial formation of proto-ice cluster at 3.98 C which are lighter than liquid water and reduce the overall density of the mixture.

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Q: Why is water more dense than liquid water?
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