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In [[physics]] and [[chemistry]], the '''Faraday constant''' (named after [[Michael Faraday]]) is the magnitude of [[electric charge]] per [[mole (unit)|mole]] of [[electron]]s.<ref>The term "magnitude" is used in the sense of "[[absolute value]]": The charge of an electron is negative, but ''F'' is always defined to be positive.</ref> It has the currently accepted [[value]]
This is a preview for the new '''MathML rendering mode''' (with SVG fallback), which is availble in production for registered users.
:{{physconst|F|symbol=yes|after=.}}


The constant ''F'' has a simple relation to two other physical constants:
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:<math>F\,=\,eN_{A}</math>
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where:
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:{{physconst|e|symbol=yes|round=auto|after=;}}
:{{physconst|NA|symbol=yes|round=auto|after=.}}
''N''<sub>A</sub> is the [[Avogadro constant]] (the ratio of the number of particles 'N' to the amount of substance 'n' - a unit mole), and ''e'' is the [[elementary charge]] or the magnitude of the [[electric charge|charge]] of an [[electron]]. This relation is true because the amount of charge of a mole of electrons is equal to the amount of charge in ''one'' electron multiplied by the number of electrons in a mole.


The value of ''F'' was first determined by weighing the amount of [[silver]] deposited in an electrochemical reaction in which a measured [[Current (electricity)|current]] was passed for a measured time, and using [[Faraday's law of electrolysis]].<ref>[http://physics.nist.gov/cuu/Constants/historical1.html NIST Introduction to physical constants]</ref> Research is continuing into more accurate ways of determining the interrelated constants ''F'', ''N''<sub>A</sub>, and ''e''.
Registered users will be able to choose between the following three rendering modes:  


==Other Common Units of Faraday's Constant==
'''MathML'''
* 96,485 J (96.485 kJ) per volt gram equivalent
:<math forcemathmode="mathml">E=mc^2</math>
* 23.061 kcal per volt gram equivalent
* 26.801 A·h/mol


==Faraday unit of charge==
<!--'''PNG'''  (currently default in production)
:<math forcemathmode="png">E=mc^2</math>


Related to Faraday's constant is the "faraday", a unit of [[electrical charge]]. It is much less common than the [[coulomb]], but sometimes used in electrochemistry.<ref>[http://books.google.com/books?id=r-Qpy0KQayIC&pg=PA51 ''Foundations Of Physics, Volume 2'', by R. S. Gambhir, p51]</ref> One Faraday of charge is the magnitude of the charge of one mole of electrons, i.e. {{physconst|F|unit=no|after=&nbsp;[[coulomb|C]].}}
'''source'''
:<math forcemathmode="source">E=mc^2</math> -->


Expressed in faradays, the Faraday constant F equals "1 faraday of charge per mole".
<span style="color: red">Follow this [https://en.wikipedia.org/wiki/Special:Preferences#mw-prefsection-rendering link] to change your Math rendering settings.</span> You can also add a [https://en.wikipedia.org/wiki/Special:Preferences#mw-prefsection-rendering-skin Custom CSS] to force the MathML/SVG rendering or select different font families. See [https://www.mediawiki.org/wiki/Extension:Math#CSS_for_the_MathML_with_SVG_fallback_mode these examples].


This faraday unit is not to be confused with the [[farad]], an unrelated unit of [[capacitance]].
==Demos==


==See also==
Here are some [https://commons.wikimedia.org/w/index.php?title=Special:ListFiles/Frederic.wang demos]:
* [[Farad]], unit of capacitance
* [[Michael Faraday]]
* [[Faraday cage]]
* [[Faraday efficiency]]
* [[Faraday's law of electrolysis]]
* Faraday's law of [[Electromagnetic induction]]


==References==
{{reflist}}


<!-- Some of these cats may be redundant -->
* accessibility:
** Safari + VoiceOver: [https://commons.wikimedia.org/wiki/File:VoiceOver-Mac-Safari.ogv video only], [[File:Voiceover-mathml-example-1.wav|thumb|Voiceover-mathml-example-1]], [[File:Voiceover-mathml-example-2.wav|thumb|Voiceover-mathml-example-2]], [[File:Voiceover-mathml-example-3.wav|thumb|Voiceover-mathml-example-3]], [[File:Voiceover-mathml-example-4.wav|thumb|Voiceover-mathml-example-4]], [[File:Voiceover-mathml-example-5.wav|thumb|Voiceover-mathml-example-5]], [[File:Voiceover-mathml-example-6.wav|thumb|Voiceover-mathml-example-6]], [[File:Voiceover-mathml-example-7.wav|thumb|Voiceover-mathml-example-7]]
** [https://commons.wikimedia.org/wiki/File:MathPlayer-Audio-Windows7-InternetExplorer.ogg Internet Explorer + MathPlayer (audio)]
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** [https://commons.wikimedia.org/wiki/File:MathPlayer-Braille-Windows7-InternetExplorer.png Internet Explorer + MathPlayer (braille)]
** NVDA+MathPlayer: [[File:Nvda-mathml-example-1.wav|thumb|Nvda-mathml-example-1]], [[File:Nvda-mathml-example-2.wav|thumb|Nvda-mathml-example-2]], [[File:Nvda-mathml-example-3.wav|thumb|Nvda-mathml-example-3]], [[File:Nvda-mathml-example-4.wav|thumb|Nvda-mathml-example-4]], [[File:Nvda-mathml-example-5.wav|thumb|Nvda-mathml-example-5]], [[File:Nvda-mathml-example-6.wav|thumb|Nvda-mathml-example-6]], [[File:Nvda-mathml-example-7.wav|thumb|Nvda-mathml-example-7]].
** Orca: There is ongoing work, but no support at all at the moment [[File:Orca-mathml-example-1.wav|thumb|Orca-mathml-example-1]], [[File:Orca-mathml-example-2.wav|thumb|Orca-mathml-example-2]], [[File:Orca-mathml-example-3.wav|thumb|Orca-mathml-example-3]], [[File:Orca-mathml-example-4.wav|thumb|Orca-mathml-example-4]], [[File:Orca-mathml-example-5.wav|thumb|Orca-mathml-example-5]], [[File:Orca-mathml-example-6.wav|thumb|Orca-mathml-example-6]], [[File:Orca-mathml-example-7.wav|thumb|Orca-mathml-example-7]].
** From our testing, ChromeVox and JAWS are not able to read the formulas generated by the MathML mode.


[[Category:Electrochemistry]]
==Test pages ==
[[Category:Physical constants]]
[[Category:Michael Faraday]]
[[Category:Units of electrical charge]]
[[Category:Units of amount of substance]]


To test the '''MathML''', '''PNG''', and '''source''' rendering modes, please go to one of the following test pages:
*[[Displaystyle]]
*[[MathAxisAlignment]]
*[[Styling]]
*[[Linebreaking]]
*[[Unique Ids]]
*[[Help:Formula]]


{{physical-chemistry-stub}}
*[[Inputtypes|Inputtypes (private Wikis only)]]
{{electromagnetism-stub}}
*[[Url2Image|Url2Image (private Wikis only)]]
 
==Bug reporting==
[[ar:ثابت فاراداي]]
If you find any bugs, please report them at [https://bugzilla.wikimedia.org/enter_bug.cgi?product=MediaWiki%20extensions&component=Math&version=master&short_desc=Math-preview%20rendering%20problem Bugzilla], or write an email to math_bugs (at) ckurs (dot) de .
[[br:Digemmenn Faraday]]
[[ca:Constant de Faraday]]
[[cs:Faradayova konstanta]]
[[de:Faraday-Konstante]]
[[et:Faraday arv]]
[[es:Constante de Faraday]]
[[eo:Konstanto de Faraday]]
[[fa:ثابت فارادی]]
[[fr:Constante de Faraday]]
[[ko:패러데이 상수]]
[[it:Costante di Faraday]]
[[he:קבוע פאראדיי]]
[[kk:Фарадей саны]]
[[hu:Faraday-állandó]]
[[nl:Faradayconstante]]
[[ja:ファラデー定数]]
[[pnb:فراڈے کانسٹنٹ]]
[[km:ថេរហ្វារ៉ាដេយ]]
[[pcd:Constante d’Faraday]]
[[pl:Stała Faradaya]]
[[pt:Constante de Faraday]]
[[ru:Постоянная Фарадея]]
[[sk:Faradayova konštanta]]
[[sl:Faradayeva konstanta]]
[[sr:Фарадејева константа]]
[[sh:Faradayjeva konstanta]]
[[fi:Faradayn vakio]]
[[sv:Faradays konstant]]
[[tr:Faraday sabiti]]
[[uk:Число Фарадея]]
[[zh:法拉第常数]]

Latest revision as of 22:52, 15 September 2019

This is a preview for the new MathML rendering mode (with SVG fallback), which is availble in production for registered users.

If you would like use the MathML rendering mode, you need a wikipedia user account that can be registered here [[1]]

  • Only registered users will be able to execute this rendering mode.
  • Note: you need not enter a email address (nor any other private information). Please do not use a password that you use elsewhere.

Registered users will be able to choose between the following three rendering modes:

MathML

E=mc2


Follow this link to change your Math rendering settings. You can also add a Custom CSS to force the MathML/SVG rendering or select different font families. See these examples.

Demos

Here are some demos:


Test pages

To test the MathML, PNG, and source rendering modes, please go to one of the following test pages:

Bug reporting

If you find any bugs, please report them at Bugzilla, or write an email to math_bugs (at) ckurs (dot) de .

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