Talk:Vacuum

message: In the text it says the following
: In medieval Europe, the Catholic Church regarded the idea of a vacuum as against nature or even heretical; the absence of anything implied the absence of God, and harkened back to the void prior to the creation story in the Book of Genesis.
As a source it lists Edward Grant (1981), but does not list a page. However, when I checked pages 108–109 of said source, it points out that, after 1277, Christian scholars came to believe that "God could create or allow a vacuum beyond the world". Reading further, it appears that what the church found abhorrent was the idea of a pre-creation void, rather than the existence of a vacuum itself. I.e. their qualm was with a void that existed without a God; not with the idea that a void implied that God didn't exist. I know it's a nuance of interpretation, but the current wording in the article just makes the scholars of the time seem completely ignorant. Regards, RJH (talk) 15:11, 24 March 2012 (UTC)
replies: text: The void beyond the world would become an attractive location for Heaven in syncretic accord with the unused real-estate in Aristotelian cosmology (never mere vacuum). FWIW, note that it says against nature or even heretical… If it can't be verified, perhaps it should be clipped at the semicolon?—Machine Elf 1735 15:31, 24 March 2012 (UTC)
thread_title:  Catholic Church and the vacuum 

message: Should this just be tossed?? (see gauge pressure under "pressure measurement)
Vacuum is measured in absolute terms with the "highest vacuum pressure" = 1 atm BY DEFINITION. On Jupiter, a new definition of atm pressure could be used. Any pressure below the defined "atm" on Jupiter might be considered a vacuum. This is not the same as "relative versus absolute" which is normally associated with systems where vacuum is measured as a negative pressure (relative to atm or "gauge pressure" see pressure measurement).
Bubsir (talk) 04:01, 24 July 2013 (UTC)
replies: text: I agree.  This unsourced section was already bad when this 2010 edit expanded it to two sections.  There may be something to it, but as written it doesn't make a lot of sense.  Can you find some sources and rework it appropriately?  Dicklyon (talk) 05:17, 24 July 2013 (UTC)
thread_title:  6.1 Relative versus absolute measurement 

message: Hi All, I just removed a poorly phrased reference to the Casimir effect in the quantum mechanics section. Although it is indeed often described as related to vacuum energy etc., there are also other ideas such as relativistic van der Waals forces. I am by no means an export on this, so perhaps someone can shed light on whtehter it's ipmortant to refer to the Casimir effiect here. At least it should then be properly phrased including caveats.WijzeWillem (talk) 09:42, 15 January 2014 (UTC)
thread_title:  Casimir effect? 

message: What is the temperature of a perfect vacuum?  I assume it would be zero.  70.247.161.12 (talk) 02:35, 31 March 2014 (UTC)
replies: text: Per wp:talk page guidelines, please see wp:reference desk/Science - DVdm (talk) 09:10, 31 March 2014 (UTC)
thread_title:  Temperature of Perfect Vacuum 

message: At one time, water aspirators were quite common so people have a "feel" for how strong the vacuum is.  Can someone add that to the table on the main page?  It can be debated, but I'd put the useful working range at from 50 torr down to around 15 torr or even 12 torr (vapor pressure of cold tap water in the winter).
Come to think of it, there is no mention of water aspirator anywhere in the main article.  Add a cross-reference someplace? AdderUser (talk) 11:18, 5 June 2014 (UTC)
replies: text: This article here appears to be about the "low pressure" sense of the term "vacuum" rather than the devices for accomplishing it. We have a whole separate article on vacuum pumps, that does mention aspirators. I added a more visible link to that article rather than trying to cherry-pick examples of who might recognize which of them from different eras/genres. DMacks (talk) 14:40, 5 June 2014 (UTC)
thread_title:  Add "[[Aspirator_(pump)|Water Aspirator]]" or "[[Aspirator_(pump)|Aspirator Pump]]" to table? 

message: This statement seems to leap out of nowhere, and not be related to the surrounding paragraphs:
*The explanation of a clepsydra or water clock was a popular topic in the Middle Ages. Although a simple wine skin sufficed to demonstrate a partial vacuum, in principle, more advanced suction pumps had been developed in Roman Pompeii.
What does the explanation of a clepsydra have to do with defining a vacuum?  Following the link to the water clock article fails to answer this question -- the word vacuum does not appear anywhere in that otherwise interesting article.  Nor does the term wine skin.  Nor does the article say anything whatsoever about any kind of "suction pumps" being in any way connected with water clocks.
Either this statement requires more detail, explaining what the water clock has to do with the historical interpretation of "vacuum", or a better, more explanatory link needs to be provided, or else the statement needs to be removed from the article.  As it stands now, it appears to be a non sequitur.  — Preceding unsigned comment added by 74.95.43.249 (talk) 20:36, 30 September 2014 (UTC)
replies: text: After three years there was still no explanation of why these statements are relevant to the article, so I removed them.  CodeTalker (talk) 04:09, 22 February 2018 (UTC)
thread_title:  Historical Interpretation 

message: In engineering and applied physics vacuum refers to any pressure lower than atmospheric. I just added a sentence about this in the lead, but would propose to also change the first sentence to something like "Vacuum can refer to space completely devoid of mater or space with a pressure lower than atmospheric pressure.". I argue that the engineering definition is the most important one since this is the field where vacuum is used the most. I think that all books about vacuum use the low pressure definition, and I'm sure all books I have read does. Ulflund (talk) 03:55, 14 January 2015 (UTC)
thread_title:  Definition 

message: In the first paragraph there is an appropriate statement referring to the arse of a Mr. Phil England. 
This needs to be removed.
:Reverted, thanks. Materialscientist (talk) 02:46, 13 April 2015 (UTC)
thread_title:  Vandalism 

message: " Most artificial satellites operate in this region called low Earth orbit and must fire their engines every few days to maintain orbit." I find this sentence to be dubious and think it should be removed. Asgrrr (talk) 16:03, 12 June 2016 (UTC)
replies: text: Perhaps a proper source can be found with  Google Scholar or &tbm=bks Google Books, or through our articles Orbital decay or Orbital station-keeping. - DVdm (talk) 16:46, 12 June 2016 (UTC)
thread_title:  Low Earth orbit 

message: The vacuum from quantum field theory is a very distinct concept from the gas vacuums discussed in the rest of the article.  Obviously they are related by the idea of absence of matter, but the "quantum mechanics" section leans much too heavily on the fact that they share the same name without actually explaining how they differ.   Jess (talk) 12:35, 2 July 2016 (UTC)
thread_title:  QFT Vacuum 

message: How is Torr still the first column of the tables? SI units should be used as a priority.
130.83.66.46 (talk) 09:47, 14 February 2017 (UTC)
thread_title:  Priority of SI units 

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message: Vacuum is not a void. Information can not be separated from the material carrier. Transmission of information using waves in a vacuum means that a vacuum is a kind of matter. If the vacuum is not matter, it means that information can be separated from material carriers. Physics has a good experience in the study of matter, but there are certain problems in the study of information. Vacuum is a kind of matter, devoid of substance. 212.115.245.17 (talk) 08:34, 24 November 2018 (UTC)
replies: text: Got refs? To include that or redefine based on such would require WP:reliable sources. Vsmith (talk) 13:04, 24 November 2018 (UTC)
replies: text: Reliable sources are a subjective concept. I have sources that are reliable for me. But I do not know if they are reliable for the rest. You can blame me, but Wikipedia has some known flaws, including an inconsistent system of rules. I had enough time to study this system and I know about the main drawback of the Five Pillars. Authority is not a guarantee of the truth of knowledge. The requirement of credibility does not guarantee improvement of Wikipedia articles (and this is the main goal). Science is an area where the minority prevails over the majority, so the right things can sometimes be perceived as marginal ... Here is one source (in Russian) https://storage.googleapis.com/dotu-154621.appspot.com/20040623-DOTU.pdf (see page 302, 336) or video lecture by Professor Zaznobin (in Russian) https://www.youtube.com/watch?v=d3mBP6Yl1Jg . Vacuum research is the forefront of science, so you are very lucky to deal with such information. 212.115.245.146 (talk) 19:31, 24 November 2018 (UTC)
replies: text:  Indeed, reliable sources are a subjective concept. That is why Wikipedia needs wp:Secondary sources. Also, by design, Wikipedia tends to shun the forefront of science—see wp:FRINGE and wp:UNDUE. If we like to deal with such forefront information, we need to go elsewhere. - DVdm (talk) 10:07, 25 November 2018 (UTC)
thread_title:  Vacuum is a kind of matter 

message: This section has a few issues, such as its reference to Torricelli as if he hadn't been mentioned in the article yet, questionable grammar in the second paragraph, and no references given for assertions made. I thought asking for others to take a look might be a better idea than making changes. 2603:8000:BA00:4B00:7113:D829:1CAB:41E1 (talk) 04:16, 4 March 2023 (UTC)
thread_title:  "Measurements relative to 1 atm" Section