Piggybacking off of a recent question asking whether drinking cold water means drinking the most water.
In: Physics
I’ll just add that while water is definitely the most common everyday substance which bucks the trend of being more dense as a solid than as a liquid, it’s not unique. Gallium, germanium, and silicon are also less dense in solid form.
Also, there are other kinds of ice with different crystal structures, and some of them are more dense than liquid water. But at the temperatures and pressures found on Earth, hexagonal ice (aka ice I) is pretty much the only kind that can form.
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