When we think of ice it is most often as an ordered, crystalline phase that you get out of the ice box, but the most common form of ice is amorphous, that is disordered, and there are two forms of amorphous ice with low and high density.
The two forms can interconvert and there have been speculations that they can be related to low- and high-density forms of liquid water.
“We found that water can exist as two different liquids at low temperatures (minus 234 degrees Fahrenheit, or minus 148 degrees Celsius) where ice crystallization is slow,” said Anders Nilsson, professor in chemical physics at Stockholm University, and senior author of the paper reporting the results in the Proceedings of the National Academy of Science.
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