World’s first discovery of ice XXI: A new form of ice born under two gigapascals of pressure at room temperature
Peer-Reviewed Publication
Updates every hour. Last Updated: 24-Nov-2025 03:11 ET (24-Nov-2025 08:11 GMT/UTC)
The Korea Research Institute of Standards and Science (KRISS, President Lee Ho Seong) has successfully observed, for the first time, the multiple freezing-melting process of water under ultrahigh pressure exceeding 2 gigapascals (2 GPa) at room temperature on a microsecond (μs, one-millionth of a second) timescale.
This breakthrough led to the world’s first discovery of a previously unknown crystallization pathway of water and a new 21st ice phase, named Ice XXI.
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