Still waters run still deeper

Article Abstract:

Computer-aided research has cast doubt on the current theory for the remarkable qualities of supercooled water. These qualities include the fact that frozen water is less dense than liquid water in contrast to most other compounds. The stability-limit hypothesis, which attributes the qualities to a spinodal or metastable limit line of second-order phase transitions, has been generally accepted by researchers. However, Peter H. Poole and colleagues found no evidence of a spinodal in their computer simulation. They suggest high- and low-density phases for ice as a new explanation.

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A self-consistent phase diagram for supercooled water

Article Abstract:

Majority of the low-temperature thermodynamic properties of water show anomalous behavior which tend to diverge in the supercooled state. Molecular dynamics simulations have attributed these phenomena to a critical point which put an end to the coexistence of temperature and pressure which separate low- and high-density amorphous ices. Problems arise when water tends to lose its anomalous behavior in the pressure range for the new critical point. The results of a series of molecular dynamics simulations at constant pressure is presented.

Analysis, Chemical research

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Two waters and no ice please

Article Abstract:

There have been studies done on measurements of supercooled water subjected to low temperatures. A study which extends simulations of cold water to longer timescales shows that water transforms into another liquid as it approaches a low temperature stability limit. The most common framework for understanding phase transitions and stability limits is the van der Waals study of the transition from liquid to gas.

Condensation

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