Talk:Geometrized unit system: Difference between revisions
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== |
== Potential == |
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Should this be moved to [[geometrized unit]] (singular)? Sometimes the plural is appropriate in an article title; is this such a case? [[User:Michael Hardy|Michael Hardy]] 15:46, 18 Dec 2003 (UTC) |
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as it is now, the two entries "elecitric potential" and "potential" (the very last) are identical. would it not make much more sense to interpret the second potential as gravitational potential? then its SI dimension would be [''L''<sup>2</sup> ''T''<sup>-2</sup>] (the same as energy/mass), and the multiplication factor would just be c<sup>-2</sup>. --[[User:Diogenes2000|Diogenes2000]] ([[User talk:Diogenes2000|talk]]) 02:51, 30 December 2012 (UTC) |
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I moved it to '''geometrized unit system''', for in this case the plural was used to identify a category. Thanks for the comment. |
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==8πG=1== |
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Isn't sometimes 8πG set to 1? --[[User:Pjacobi|Pjacobi]] 11:05, July 31, 2005 (UTC) |
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:There actually are several different systems involved here. Your "sometimes" and the "sometimes" starting the second paragaph of the article are clues to that fact. [[User:Gene Nygaard|Gene Nygaard]] 11:16, 31 July 2005 (UTC) |
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Yes, 8πG is another common convention, as is 16πG=1. This is problematic. My impression is that the most common modern convention is 8πG=1, but I could be mistaken. –[[User:Joke137|Joke137]] 18:10, 2 October 2005 (UTC) |
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::But what about Wald, ''General relativity'', Appendix F, which uses c = G =1? This is probably the most widely used graduate textbook on general relativity in the English-speaking world. Can anyone cite a major textbook which used either of the other two conventions mentioned by Joke137? ---[[User:Hillman|CH ]] [[User_talk:Hillman|(talk)]] 01:33, 3 October 2005 (UTC) |
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==Students beware== |
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I extensively edited the August 2006 version of this article and had been monitoring it for bad edits, but |
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I am leaving the WP and am now abandoning this article to its fate. |
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Just wanted to provide notice that I am only responsible (in part) for the last version I edited; see [[User:Hillman/Archive]]. I emphatically do not vouch for anything you might see in more recent versions, although I hope for the best. |
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Good luck in your search for information, regardless!---[[User:Hillman|CH]] 23:52, 30 June 2006 (UTC) |
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==MKS charge units== |
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I believe there should be a entry for converting SI charge units in the official conversion table. |
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Using google calculator, I get for the conversion constant: |
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<math>\sqrt{G / 4 \pi \epsilon_0 c^4} </math> = sqrt(G / (4 * Pi * electric constant * c^4)) = 8.61667791 × 10-18 m / coulomb |
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question: what source should be used for constant values? |
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[[User:Pervect|Pervect]] 23:09, 22 July 2006 (UTC) |
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==Edits== |
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I've made the edits indicated above, having gotten no comments. The conversion table from Wald is for cgs units, unfortunately. This would only matter for charge and related electrical units. I've marked up the table to indicate it's a cgs table as the simplest course of action to fix the issue. |
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consistency checks: |
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:1 statcolumb * sqrt(G)/c^2 -> 2.87 * 10^-25 cm = 2.87* 10^-27 m |
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:1 coulomb -> 8.62 * 10^-18 m (from MKS table) |
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:1 statcolumb / 1 coulomb = 3.33*10^-10 |
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consistent with http://en.wikipedia.org/wiki/Statcoulomb |
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This is incosistent with the wiki [[cgs]] page, however! |
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more consistency checks: |
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:charge of electron = 1.381*10^-34 cm (MTW back cover) |
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:charge of electron = 1.60*10^-19 coulomb * 8.62*10^-18 m/coulomb = 1.38*10^-36 m = 1.38*10^-34 cm |
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[[User:Pervect|Pervect]] 22:41, 29 July 2006 (UTC) |
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==More edits== |
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I went through and added the SI units and conversion factors to the table (a major edit at least in terms of work). |
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I cross-checked the conversion formulas for SI units with google calculator. Examples (cut and paste the following formula into google calc). epsilon_0 is "electric constant" in Google. |
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:(amps)*(sqrt(G/(4*pi*electric constant)))/c^3= |
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:(tesla)*(sqrt(G*(4*pi*electric constant))/c)= |
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:(volts)*(sqrt(G*(4*pi*electric constant))/c^2)= |
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==Conversion factors between meter, kilogram, second, coulomb and kelvin== |
==Conversion factors between meter, kilogram, second, coulomb and kelvin== |
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All these units represents nothing else than distance along dimension, that makes SI redundant in comparison to geometrized units. I added all these abovementioned factors after proper formatting to article. They can be verified in Google calculator. |
All these units represents nothing else than distance along dimension, that makes SI redundant in comparison to geometrized units. I added all these abovementioned factors after proper formatting to article. They can be verified in Google calculator. |
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This all is exactly equivalent to dividing of one [[Planck unit]] by another [[Planck unit]], while using their direct SI values. [[Special:Contributions/83.30.150.203|83.30.150.203]] ([[User talk:83.30.150.203|talk]]) 08:20, 20 January 2024 (UTC) |
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==Introduction== |
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Hello Pervect |
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== Geometric quantities == |
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It seems that the sentence is incomplete: |
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I removed an entire section with a table of conversions. @[[User:Anubub|Anubub]] reverted the change, but I took it out again based on [[WP:BURDEN]]. |
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In situations involving electrical units, we add the constraint that the quantity 4πε<sub>0</sub>, where ε<sub>0</sub> is [[vacuum permittivity]]. [[Special:Contributions/83.30.48.117|83.30.48.117]] ([[User talk:83.30.48.117|talk]]) 18:00, 28 October 2009 (UTC) |
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The table entries need a reference. If the entries are trivial, then we don't need the table. If the entries are [[WP:NOTABLE]] then they need a reference. |
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== Plagiarism == |
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Much of the article is copied from: [http://www.statemaster.com/encyclopedia/Geometrized-unit-system here].--[[Special:Contributions/76.99.197.112|76.99.197.112]] ([[User talk:76.99.197.112|talk]]) 15:50, 7 February 2010 (UTC) |
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In addition, the practical issue is that entries in the table keep being changed and we have no justification for reverting such changes because we have no reference. [[User:Johnjbarton|Johnjbarton]] ([[User talk:Johnjbarton|talk]]) 16:09, 24 June 2024 (UTC) |
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And this in turn is ripped from earlier revisions of this Wikipedia article, see [http://en.wikipedia.org/enwiki/w/index.php?title=Geometrized_unit_system&action=historysubmit&diff=118893859&oldid=118728377 this diff]. [[Special:Contributions/194.24.174.235|194.24.174.235]] ([[User talk:194.24.174.235|talk]]) 12:25, 26 September 2010 (UTC) |
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Latest revision as of 19:09, 30 June 2024
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Potential
[edit]as it is now, the two entries "elecitric potential" and "potential" (the very last) are identical. would it not make much more sense to interpret the second potential as gravitational potential? then its SI dimension would be [L2 T-2] (the same as energy/mass), and the multiplication factor would just be c-2. --Diogenes2000 (talk) 02:51, 30 December 2012 (UTC)
Conversion factors between meter, kilogram, second, coulomb and kelvin
[edit]Here you have all needed conversion factors that covers all SI base units, and if not possible, their unique elements:
into m
- G/c^2 [m/kg]
- c [m/s]
- ((G/(4*pi*(electric constant)))^0.5)/c^2 [m/C]
- (G*k)/c^4 [m/K]
into kg
- c^2/G [kg/m]
- c^3/G [kg/s]
- 1/(G*4*pi*(electric constant))^0.5 [kg/C]
- k/c^2 [kg/K]
into s
- 1/c [s/m]
- G/c^3 [s/kg]
- ((G/(4*pi*(electric constant)))^0.5)/c^3 [s/C]
- (G*k)/c^5 [s/K]
into C
- c^2/((G/(4*pi*(electric constant)))^0.5) [C/m]
- (G*4*pi*(electric constant))^0.5 [C/kg]
- c^3/((G/(4*pi*(electric constant)))^0.5) [C/s]
- (k*(G*4*pi*(electric constant))^0.5)/c^2 [C/K]
into K
- c^4/(G*k) [K/m]
- c^2/k [K/kg]
- c^5/(G*k) [K/s]
- c^2/(k*(G*4*pi*(electric constant))^0.5) [K/C]
All these units represents nothing else than distance along dimension, that makes SI redundant in comparison to geometrized units. I added all these abovementioned factors after proper formatting to article. They can be verified in Google calculator.
This all is exactly equivalent to dividing of one Planck unit by another Planck unit, while using their direct SI values. 83.30.150.203 (talk) 08:20, 20 January 2024 (UTC)
Geometric quantities
[edit]I removed an entire section with a table of conversions. @Anubub reverted the change, but I took it out again based on WP:BURDEN.
The table entries need a reference. If the entries are trivial, then we don't need the table. If the entries are WP:NOTABLE then they need a reference.
In addition, the practical issue is that entries in the table keep being changed and we have no justification for reverting such changes because we have no reference. Johnjbarton (talk) 16:09, 24 June 2024 (UTC)