Can water be compressed so much that it freezes?

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    Compressed Water
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Discussion Overview

The discussion revolves around the question of whether water can be compressed to the point of freezing under extreme pressure. Participants explore the implications of pressure on the state of water, including temperature changes and phase transitions, while considering the complexities of water's behavior under such conditions.

Discussion Character

  • Exploratory
  • Debate/contested
  • Technical explanation
  • Conceptual clarification

Main Points Raised

  • Some participants suggest that water can indeed freeze under extreme pressure, although this notion is counter-intuitive.
  • There is confusion regarding the relationship between pressure and temperature, with some arguing that increased pressure should lead to increased temperature, while others note that this is not universally applicable to liquids like water.
  • Participants discuss the requirement for molecular movement in freezing, indicating that molecules need space to crystallize, which may be hindered under extreme compression.
  • One participant mentions that different forms of ice exist, suggesting that water's behavior under pressure is complex and not straightforward.
  • There is a debate about whether solidification is influenced by temperature changes or is purely a result of applied pressure.
  • Some participants reference phase diagrams and the triple point of water to illustrate their points, with varying interpretations of how pressure affects phase transitions.
  • Concerns are raised about the idealization of fluids as incompressible, with some participants questioning the validity of this assumption under high pressures.

Areas of Agreement / Disagreement

Participants express multiple competing views regarding the effects of pressure on water's state and the conditions under which it may freeze. The discussion remains unresolved, with no consensus on the implications of pressure and temperature interactions for water.

Contextual Notes

Participants highlight the limitations of using the ideal gas law for liquids and the need for more complex equations of state when discussing water under extreme conditions. The discussion also reflects varying interpretations of phase diagrams and their implications for water's behavior under pressure.

  • #31
ChmDudeCB said:
Exactly. What we call "frozen water" isn't the only solid form of water, it's just the crystal structure that happens to form at atmospheric pressure. If you compress anything below its supercritical temperature it will eventually become solid (or a glass).

However, are you sure your phase diagram is accurate? IIRC once you pass the supercritical points of temperature and pressure, that is all that exists. I could be wrong and/or my P-chem professor left something out.

The supercritical point is just a point where the line of first order transitions between liquid and vapor ends. The critical point itself is point where there is a second order transition. There the heat capacity diverges with a certain universal critical exponent.

But this has nothing to do with the other phase transitions in the phase diagram.
 
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  • #33
DaveC426913 said:
Freezing the water requires that the molecules have a chance to crystalize. Crystalizing requires that the molecules have enough elbow room to do so. It's not that water wil NOT freeze under extrreme pressure, it's just that water is very complex. There are actually almost a dozen forms of ice water. Ice I (naturally-formed water-ice) is only one.

QUESTION: Does this hold true for all elements?
 

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