Scientists Observe Mysterious Phase Transition in Supercooled Water

An international team of researchers, led by Arizona State University chemist C. Austen Angell and University of Amsterdam’s Dr. Sander Woutersen, has observed one of the more intriguing properties predicted by water theoreticians — that, on sufficient supercooling and under specific conditions it will suddenly change from one liquid to a different one. The new liquid is still water but now it is of lower density and with a different arrangement of the hydrogen bonded molecules with stronger bonding that makes it a more viscous liquid. The results appear today in the journal Science.