I've asked a similar question here but the answer given shows the behaviour of water under general conditions.

I'd like to know what the behaviour of water is like as pressures increase towards infinity without being able to escape it's confinement.. i.e. a ball of water at the core of a galactic mass.. maybe this question is more for theoretical physics since we can't really measure or experiment?

  • $\begingroup$ The answer you got there is likely the one you may receive here. You should really make sure you understand that one before continuing your search. $\endgroup$ – André Chalella Nov 26 '14 at 3:16
  • $\begingroup$ @AndréNeves that last answer is helpful for understanding the behaviour of water under relatively low pressures and temperatures. I'm looking to see what happens after the 'ice' cannot rearrange structure anymore yet pressure continues to increase. $\endgroup$ – irth Dec 1 '14 at 4:05
  • $\begingroup$ I fail to understand what this would be. How much pressure would that be, in pascals? Here, take a look: en.wikipedia.org/wiki/Orders_of_magnitude_(pressure) $\endgroup$ – André Chalella Dec 1 '14 at 12:28
  • $\begingroup$ Cheers, @AndréNeves. That's a good resource. The pressures I'm looking at fall between 10^11 and 10^16 Pa. $\endgroup$ – irth Dec 1 '14 at 22:14
  • $\begingroup$ Then the top region of the chart mentioned in CSE (i.stack.imgur.com/RpaIc.png) is not "relatively low pressure", but in the order of magnitude you want. However, I don't know how very high temperatures (15 million K, core of Sun) would affect the state of the water. $\endgroup$ – André Chalella Dec 2 '14 at 1:39

Yes, the question is theoretical and so the response. Under enough pressure water will become a solid, regardless of temperature. That is, as far as it is still water. If pressure is high enough, the atoms will collapse and form neutron-degenerate matter (theorized to exist in the cores of neutron stars). I am not sure if there could be an intermediate mixed phase in between water and "neutronium" in which only one of the atoms collapese first (either H or O) and the other at a larger pressure.

  • $\begingroup$ Some studies suggest that at some pressure point between ice and fusion, water takes on metallic characteristics. $\endgroup$ – irth Dec 1 '14 at 4:06
  • $\begingroup$ Would it be a solid in the core of the Sun (25 PPa, 15.6 MK)? It must be simple, but I couldn't figure that out. $\endgroup$ – André Chalella Dec 2 '14 at 1:42

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