View source for Talk:Absolute zero

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== External links modified ==

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== Move discussion in progress ==

There is a move discussion in progress on [[Talk:Absolute Zero (disambiguation)#Requested move 11 September 2019 |Talk:Absolute Zero (disambiguation)]] which affects this page. Please participate on that page and not in this talk page section. Thank you. <!-- Talk:Absolute Zero (disambiguation) crosspost --> —[[User:RMCD bot|RMCD bot]] 09:01, 11 September 2019 (UTC)

== Very low temperatures. ==

In this section, the first point says:

The current world record was set in 1999 at 100 picokelvins (pK), or 0.0000000001 of a kelvin, by cooling the nuclear spins in a piece of rhodium metal.

But by the bullet points below that one, this is clearly no longer the case, right? Take e.g. the last bullet point:

[...] In a space-based laboratory, temperatures as low as 10 picokelvin ( 10 − 12 {\displaystyle 10^{-12}} 10^{-12} K) temperatures have been achieved,  [...]

Well, according to this source: https://www.ctvnews.ca/sci-tech/scientists-create-coldest-temperature-ever-in-a-lab-to-help-understand-quantum-mechanics-1.5632054 (and among many others) say that in 2021 the record was 38 trillionths above -273.15C. So, we should make a change on that.  <!-- Template:Unsigned IP --><small class="autosigned">—&nbsp;Preceding [[Wikipedia:Signatures|unsigned]] comment added by [[Special:Contributions/2601:5C7:4100:3600:259F:CC85:5F10:EECE|2601:5C7:4100:3600:259F:CC85:5F10:EECE]] ([[User talk:2601:5C7:4100:3600:259F:CC85:5F10:EECE#top|talk]]) 19:17, 25 November 2022 (UTC)</small> <!--Autosigned by SineBot-->

In Fact, I already have attempted to include this in past edits but admin editors scrapped it away. If nobody agrees to the proposal here I will just put it forward myself.

==Absolute Zero and Degrees of Freedom==
What is the difference between a temperature of 0 and the minimum kinetic energy as detailed in the discoeries section in 2000.
What are the degrees of freedom in addition to nuclear spin?
Which degree of fredom is easiset to constrain?
[[User:ScientistBuilder|ScientistBuilder]] ([[User talk:ScientistBuilder|talk]]) 18:53, 8 February 2022 (UTC)
What could be done to generate a state with no degrees of freedom in not just one but however many degrees of freedom there?
[[User:ScientistBuilder|ScientistBuilder]] ([[User talk:ScientistBuilder|talk]]) 18:56, 8 February 2022 (UTC)
What is the difference between temperature and energy and what quantum mechanical expresses related the temperature to the amounts of energy due to nuclear spin and other factors. What are the other factors besides quantum spin that contribute to the energy of the Bose-Einstein condensate?[[User:ScientistBuilder|ScientistBuilder]] ([[User talk:ScientistBuilder|talk]]) 18:58, 8 February 2022 (UTC) How much energy does it take to asymptotically reach a temperature of zero Kelvin? For example what is the difference in energy required to cool helium from 1 degree to 0.9 degree to 0.2 degrees to 0.1 degrees?
I am also wondering if there should be a distinction between thermodynamic absolute zero in one degree of freedom and absolute zero in all degrees of freedom?
 ][[User:ScientistBuilder|ScientistBuilder]] ([[User talk:ScientistBuilder|talk]]) 19:01, 8 February 2022 (UTC)

== History ==

According to this link [https://www.titech.ac.jp/english/public-relations/about/stories/absolute-zero The Challenge of Discovering Absolute Zero or -273.15 Degrees Celsius], the now official value of 0 °K = -273.15°C was first determined by Masao Kinoshita and Jiro Oishi of Tokyo Tech, Japan in 1938, and their result was finally recognised by the Consultative Committee for Thermometry of the International Committee for Weights and Measures in 1952.
The article includes additional information on how the temperature of absolute zero was determined, citing also work in the USA and Germany.  I think use of the information in this article would be a useful addition to the History section.
As I am neither a Wikipedia editor nor an expert on this subject, I leave it to others to edit the actual page section.
--[[Special:Contributions/195.213.152.87|195.213.152.87]] ([[User talk:195.213.152.87|talk]]) 12:51, 22 June 2022 (UTC)dww  (N.B. I am not former user Dww, but I've used dww as my Id on the internet since 1981, including in email, on Usenet and DMOZ.)

== William Francis Giauque ==
I was curious why William Francis Giauque is not featured anywhere in this article? 1949 Nobel laureate recognized for his studies in the properties of matter at temperatures close to absolute zero.  <!-- Template:Unsigned IP --><small class="autosigned">—&nbsp;Preceding [[Wikipedia:Signatures|unsigned]] comment added by [[Special:Contributions/142.113.219.114|142.113.219.114]] ([[User talk:142.113.219.114#top|talk]]) 15:50, 30 November 2022 (UTC)</small> <!--Autosigned by SineBot-->
{{Talk:Absolute zero/GA1}}

== Redefinition of the Kelvin ==

Perhaps a small section on the 2019 redefinition of the Kelvin scale is in order? it is no longer defined by the triple point of water, rather by the boltzmann constant. [[Special:Contributions/137.248.1.6|137.248.1.6]] ([[User talk:137.248.1.6|talk]]) 13:19, 25 September 2023 (UTC)
:This article is not about the kelvin, and it doesn't mention the triple point of water, except in "see also" and in one note.  I think it would be fine to edit the note to remove that mention; it was probably never appropriate anyway. --[[User:Trovatore|Trovatore]] ([[User talk:Trovatore|talk]]) 20:11, 25 September 2023 (UTC)
::{{done}} I got rid of the note, replaced it with a quote from the current SI brochure. [[User:Mathnerd314159|Mathnerd314159]] ([[User talk:Mathnerd314159|talk]]) 23:03, 25 September 2023 (UTC)
::: Thanks! --[[User:Trovatore|Trovatore]] ([[User talk:Trovatore|talk]]) 01:35, 26 September 2023 (UTC)

== Introduction ==

There are some vague ideas in the introduction that hint at physics beyond the standard thermodynamics. For example:
* {{tq|Absolute zero is the coldest point on the thermodynamic temperature scale...}} Suggesting that it is only a zero point of a specific scale, not the lowest possible physical temperature?
* {{tq|It is commonly thought of as the lowest temperature possible...}} Hinting that perhaps the common thought is not correct?
* {{tq|The laws of thermodynamics show that absolute zero cannot be reached using only thermodynamic means...}} Are there some non-thermodynamic means to reach the zero? 
Also, zero-point motion does not have to be discussed multiple times in the introduction. Perhaps no original research was intended here, and it's just careless writing. In any case, the introduction should be improved. [[User:Jähmefyysikko|Jähmefyysikko]] ([[User talk:Jähmefyysikko|talk]]) 04:26, 1 June 2025 (UTC)