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We distinguish between the states of matter: gas, liquid and solid. Possibly we could add the plasma state and/or the superconductive state as new states of matter. Phase transistions at certain temperature perhaps with some other conditions should have to exist. What do you think, does it make sense?

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And what is your question? Whether we should add new states of matter to the usual ones? If so, the answer is no, we shouldn't. Those three are the most common around us. Besides them there is of course a great number of other phases (just consider that ice itself has about 15 of them), so I don't see any reason why we should add just random two of them that came to your mind first (besides, both plasma and superconductors are divided into multiple additional phases as well). –  Marek Feb 7 '11 at 16:30
I voted to close, I don’t see a question here, maybe an invitation for an argument. –  user566 Feb 7 '11 at 16:33
Why is it not of some interest to discuss the concept of phases of matter and their transistions? I have three answers, perhaps four when I include Marek's comment - by the way 15 phases of ice, can you elaborate on that? I fail to see why the question would irritate anyone (an invitation for an argument?) –  Gerard Feb 8 '11 at 22:55
@Marek: you voted to close the question but also participated in answering - are you in an entangled state ? (appreciate your contributions though) –  Gerard Feb 8 '11 at 23:05
@Gerard, although I answered there was a problem with the exact wording of this question as suggested by Marek's original comment. It seemed unusually biased towards superconductivity, when there are many phases (like those ice ones) that could be discussed. So I thought that you were really asking about Superconductivity as a Phase. The question would need to be sharpened into a wider question about Phases, if that was the intention. –  Roy Simpson Feb 8 '11 at 23:18
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closed as not a real question by Moshe, Marek, genneth, Kostya, mbq Feb 7 '11 at 17:58

It's difficult to tell what is being asked here. This question is ambiguous, vague, incomplete, overly broad, or rhetorical and cannot be reasonably answered in its current form. For help clarifying this question so that it can be reopened, visit the help center.If this question can be reworded to fit the rules in the help center, please edit the question.

2 Answers

A phase transition is a Thermodynamic (therefore bulk matter) concept which pertains to abrupt changes in the physical properties of a system which occur on a boundary of a Phase Diagram. In the classic case this Phase Diagram has axes for Temperature and Pressure. Water has the three classic phases, plus a "supercritical" region above the critical point.

In the case of Superconductivity the physical change occurs on the temperature conductivity graph, but as remarked in another Answer this is not a phase transition universal to all matter.

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I don't understand the "So water has..." part. Does the "so" mean that this is some sort of conclusion derived at from previous stuff you mentioned? By the way, in general you are free to have any number of phases you want for the given material (and indeed, even water has far more than three of them because there exist lots of phases of ice). General materials can have also multiple liquid phases (e.g. stable and metastable phases of liquid carbon), (spin)glassy phases, ferromagnetic phases and basically transitions in any other order parameter you can imagine. –  Marek Feb 7 '11 at 17:28
Agreed. The "so" was superfluous and I have removed it. Your other points are valid too. –  Roy Simpson Feb 7 '11 at 22:14
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Yes, there are other phases of matter besides solid, liquid, gas, and phase transitions between these other phases work in a similar way to transitions between the more familiar phases. As another example, helium undergoes a phase transition between a "normal" fluid and a superfluid at a temperature of about 2 K.

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