Talk:Melting point

message: I'm not sure whether the melting point is for all substances the equivalent of the freezing point as stated in this article.
* you are correct in fact.  for example, agar solidifes at ~55C but melts at a higher temperature.  i will work on this later when i have the time because it is very important.  good find. -- Bubbachuck 17:49, 12 August 2005 (UTC)
replies: text: This same problem exists in the article for Melting, where I flagged it awhile back. Would you fix it there, too, please and remove my dubious flag from that article. Thanks. PS. Someone else noticed it in this article. I sign my posts. 5Q5 14:39, 13 March 2007 (UTC)
thread_title:  melting vs. freezing point 

message: Tungsten doesnt have the highest melting point of all elements, it has the highest melting point of all metals.  Carbon (melting point of 3823 K) has the highest melting point of all elements.  However, Tungsten does have the highest boiling point. —The preceding unsigned comment was added by 24.242.200.33 (talk • contribs) 10:31, 7 February 2006 (UTC)
replies: text: Carbon at ambient pressure does not melt but sublimates. A liquid phase only exists above 10 MPa. Femto 13:27, 7 February 2006 (UTC)
thread_title:  Tungsten doesnt have the highest melting point of all elements 

message: Message from OTRS: "The melting point is a characteristic of only crystalline solids, not all solids."
:Amorphous solid materials may have a glass transition to which a fictive temperature can be attributed but many do not have even that.
I agree with this point, I have always looked at the Tm as a thermodynamical property of crystals during fusion and not as a rheological parameter.  — Preceding unsigned comment added by 195.86.31.2 (talk) 11:11, 18 December 2012 (UTC)
thread_title:  Crystalline solids only? 

message: "The melting point of a pure substance is always higher than the melting point of that substance when a small amount of an impurity is present." Is this really true? Does it need qualification? Is this related to the unexplained phrase "melting-point depression" mentioned on the Lauric acid page?
--Elijah 20:59, 25 August 2006 (UTC)
replies: text: "Yes as far as I know and also based on first principles", "I don't think so", abd "exactly", respectively. Melting point depression is the phenomenon that impurities lower the melting point of a pure substance. DMacks 16:13, 28 August 2006 (UTC)
replies: text: Then could someone more knowledgeable about the subject include that here in a way that articles like the lauric acid one could link to it? --Elijah 05:21, 29 August 2006 (UTC)
thread_title:  Pure Substance 

message: Should we perhaps change this from water to some other compound? Water is in the minority in that its melting point decreases with pressure, which could be misleading. Capuchin 11:52, 17 July 2007 (UTC)
replies: text: Heheh. I agree that the graph should be changed, but I have in mind a different issue: the thing is in Kelvin. I'm not going to argue that it should be changed to Fahrenheit, given the science-y nature of the article, but Kelvin is not immediately meanigful--at all--to the average person, is it? I know it's identical to Celsius, but I had to look up the offset before that made any sense. If the idea is to convey useful information to the reader, this chart is... ineffective.  —Preceding unsigned comment added by Archer884 (talk • contribs) 20:12, 24 August 2009 (UTC)
thread_title:  Picture of melting point vs pressure. 

message: I oppose the proposal to merge this article (MP) with Melting.  As an organic chemist, I see MP as a standard test that is done on compounds to ascertain their identity and purity.  There are all sorts of rules that go along with that, relating to molecular size, symmetry, polarity, and it can be related to solubility.  All that material deserves an article by itself.  Melting is a phenomenon, a much broader subject than MP, and the article can describe the molecular forces, the physical chemistry of melting, effect of temperature and pressure, etc., latent heat of fusion, etc.  MP can be covered as a paragraph within that article, using the summary style. Walkerma 20:42, 29 July 2007 (UTC)
replies: text: In other words, if there had to be a merger it would be melting point into melting, not the current (reverse) proposal. Richard001 00:07, 15 September 2007 (UTC)
thread_title:  Proposed merger 

message: This article was automatically assessed because at least one WikiProject had rated the article as start, and the rating on other projects was brought up to start class. BetacommandBot 10:00, 10 November 2007 (UTC)
thread_title:  WikiProject class rating

message: Related to some comments above is the matter of congealing point.  --Una Smith (talk) 15:42, 10 March 2009 (UTC)
thread_title:  Congealing point 

message: Why does the water in a pond sometimes only freeze a certain percentage of the pond's water?
Is it because the unfrozen water has sufficient back pressure to prevent itself from being frozen?
Incompressability of water?  — Preceding unsigned comment added by 2.120.65.78 (talk) 15:18, 19 December 2013 (UTC)
thread_title:  Freezing in Pond's 

message: Substituted at 23:41, 29 April 2016 (UTC)
thread_title: Assessment comment

message: * www1.lsbu.ac.uk/water/density_anomalies.html Explanation of the Density Anomalies of Water
: "Pressure reduces ice's melting point (13.35 MPa gives a melting point of -1 °C)"
: "In water, this line is backward sloping with slope 13.46 MPa ˣ K-1 at 0 °C, 101.325 kPa."
Many people want to know if the pressure in water pipes lowers the freezing point. Almost all Internet info including WP is not helpful: science phase diagrams in unfamiliar units that do not show appropriate detail, only that the melt temp does not vary much with pressure under common water pipe conditions.
It would be great to have a graph of temp in C and F (not K) vs pressure in PSI for 0-10,000 PSI for inclusion in WP articles. Until then, 13.35 MPa converts to 1936.25 psi (pounds per sq. inch). We could say something like:
* Pressure in water pipes reduces the freezing point slightly: a pressure of 1936 psi lowers the freezing point to -1 °C.
The graph in the good Martin Chaplin LSBU article appears to show that 100 MPa (14,500 psi) would lower the melt temp by about 10 °C.
Typical water pipe pressures are usually around 100 psi, which apparently would lower the freezing point by a small fraction of a degree.
If the slope at zero is 13.46 MPa per degC, that works out to 0.051 °C (0.092 °F) for 100 psi.
It would be a relevant factoid to include in some articles, if we could be sure of the science/physics facts.-73.61.15.87 (talk) 20:11, 11 January 2018 (UTC)
thread_title:  pressure lowers freezing point of water a slight amount 

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thread_title:  External links modified (January 2018) 

message: :the freezing point is not considered as a characteristic property of a substance.
The International Temperature Scale of 1990 (ITS-90) uses only freezing points for all temperature definitions above the melting point of gallium. Thus 7 out of the 14 definitions are freezing points, only one is a melting point. This is in strong contradiction to the quoted statement. If its not a characteristic property how is it good enough for the definition of our temperature scale? I will alter this sentence. --Eheran (talk) 08:44, 8 December 2020 (UTC)
thread_title:  freezing point _is_ a characteristic property of a substance 

message: Boiling and Melting point in moscovium 152.32.112.60 (talk) 15:04, 24 October 2022 (UTC)
thread_title:  Chemistry