How do water’s relative densities as a solid and a liquid differ from that of most other substances?

Solid water is less dense than liquid causing it to float while other substances are mainly more dense as solids.

So water as a solid (aka ice) is actually less dense than water as a liquid (regular, liquid water). this is bc there is a specific and repeating pattern to ice amongst the hydrogen and oxygen molecules; the space in between means the atoms are less concentrated. other substances have a denser solid form

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