Talk:Sublimation (phase transition)

message: I've reverted the edit by User:Jgassens, which said that ice at temperatures below the freezing point of water does not sublimate except at low pressures. This is a common misconception, but anyone who has seen their ice cubes shrink in their freezer has seen the sublimation in action. What matters is the partial pressure of water (also see vapor pressure): if it is below the pressure for the solid-vapor equilibrium as seen in the the phase diagram, the solid will sublimate until that pressure is reached (which for an open system in a dry environment won't happen, so all of the ice will sublimate). If it is above the equilibrium pressure, the vapor will deposit on the solid until the pressure reaches the equilibrium. If the partial pressure of water is at its equilibrium value, nothing will seem to happen, but microscopically there is still sublimation and deposition going on with equal rates, resulting in a dynamic equilibrium.
This is the exact same situation as for iodine. Dry ice is different becase, at 1 atm, it is below the pressure of the triple point, which means that not only one sees sublimation, but also there is no way of having liquid CO2 at any temperature (at 1 atm). Itub 16:16, 6 February 2006 (UTC)
replies: text: I have now clarified the above sentence somewhat by noting that the presssure refers to the partial pressure (as already noted in the Introduction) and specifying the triple point (partial) pressure value. Dirac66 (talk) 19:13, 5 July 2020 (UTC)
thread_title:  Sublimation of ice 

message: The article states that formation of frost is an example of deposition, yet the phase diagram for water shows that this is not possible. The water vapor must first turn into a liquid before it can turn into a solid, because the pressure is not low enough for deposition to occur.
Here is a phase diagram for reference:
http://encarta.msn.com/media_461541579/Phase_Diagram_for_Water.html
—The preceding unsigned comment was added by Cannonstudent (talk • contribs).
:See the discussion about the sublimation of ice above. What matters is the partial pressure of water, which at low temperatures is below the triple point. Itub 08:31, 1 February 2007 (UTC)
thread_title:  Deposition of water 

message: "ALL ELEMENTS SUMBLIMATE!!!!!!" seems very unprofessional.  I suggest a removal.
--71.162.113.31 01:33, 1 February 2007 (UTC)
thread_title:  Odd Beginning 

message: Added by Vortex150:
"Sublimation is not actually correct. The solid phase actually goes through a liquid phase, at the surface of the solid, before a gas, called a two-step phase transition. See the following research paper on 21 April 2008.
"
Cheers Freestyle-69 (talk) 21:20, 16 February 2009 (UTC)
thread_title:  New research (moved from article page) 

message: We must change category because the opposite of something (chemistry) may not be somethingelse (physics).--Xoristzatziki (talk) 11:57, 18 January 2010 (UTC)
thread_title:  opposite 

message: This section contains statements which are either incorrect-unintellegible, or redundant (already reported elsewhere in the article). 
So, if there are no objections, I will completely remove it --GianniG46 (talk) 17:42, 27 September 2010 (UTC)
thread_title:  Sublimation in physics 

message: The "See Also" section of this article includes a link for Plasma->Gas transitions, labeled "Recombination" but links to Carrier generation and recombination; which seems to have nothing to do with either plasma or gas (that article is about semiconductors).  I think it's supposed to link to Plasma recombination.  I'd edit it, but I have no idea how as the table in the "See Also" section does not appear anywhere in this article's "Edit" page.  Draconx (talk) 21:12, 14 September 2012 (UTC)
thread_title:  Recombination in "See Also" 

message: I went ahead and removed the photo of the steaming poles. The image description states that strong sunlight was shining on the ice-covered poles in air temperatures "just above freezing". By definition, sublimation occurs below the melting point of a substance (in this case, water). A far more likely explanation of what's happening in the photo is that the sun is directly heating the pole, melting the ice and warming the water until it steams in the cool, moist air.
Also, it was my understanding that water sublimation can't produce visible mist at all. The conditions that allow for water sublimation and water condensation (temperature and humidity) are mutually exclusive, are they not? --Lukeonia1 (talk) 08:31, 21 December 2012 (UTC)
thread_title:  Removed steaming poles image 

message: Sublimation_(phase_transition)#Water states
 This allows a wet cloth to be hung outdoors in freezing weather and retrieved later in a dry state.
Doesn't wet imply liquid (as opposed to solid) water, so this is simply evaporation? cmɢʟee⎆τaʟκ 08:51, 26 October 2013 (UTC)
thread_title:  Wet cloth 

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thread_title:  External links modified 

message: The reverse process is not "desublimation", nor is "sublimation" used "generically" to refer  to the reverse process. The reference given states that sublimation means "to convert (a solid substance) by heat into a vapor, which on cooling condenses again to solid form". In other words, going from solid to gas is sublimation. It then mentions that something that has gone straight from solid to gas (when heated)will also go straight from gas to solid (when cooled), but that is not part of the definition. If sublimation meant the change of state in either direction, it would say "to convert (a solid substance) by heat into a vapor, or to convert (a gaseous substance) by cooling into a solid". The correct term for the opposite process is "deposition". At least I try (talk) 13:05, 5 December 2016 (UTC)
thread_title:  The Reverse Process 

message: Please add Cause if Sublimation Navjot1200 (talk) 06:34, 26 January 2018 (UTC)
replies: text: Done. See new sentence at beginning of 4th paragraph. Dirac66 (talk) 19:29, 28 January 2018 (UTC)
thread_title:  cause of sublimation 

message: In the water paragraph, the triple point pressure of 612Pa is said to be equal to 0.0006 atmospheres. It's wrong it's actually 0.006 atmospheres (x10 error).
Here is a converter so you can check : https://www.justintools.com/unit-conversion/pressure.php?k1=pascals&k2=atmosphere-atm-standard&q=610 Positive Electron (talk) 17:00, 19 January 2022 (UTC)
replies: text: Yes, you are correct, thank you. I have now corrected the article. Dirac66 (talk) 19:15, 19 January 2022 (UTC)
thread_title:  Semi-protected edit request on 19 January 2022