User talk:WilfriedC

Welcome

Welcome!

Hello, WilfriedC, and welcome to Wikipedia! Thank you for your contributions. I hope you like the place and decide to stay. Here are some pages that you might find helpful:

I hope you enjoy editing here and being a Wikipedian! Please sign your messages on discussion pages using four tildes (~~~~); this will automatically insert your username and the date. If you need help, check out Wikipedia:Questions, ask me on my talk page, or ask your question on this page and then place {{helpme}} before the question. Again, welcome! Aboutmovies (talk) 09:59, 28 May 2008 (UTC)[reply]

External links

Please don't continue to add those links across chemical articles. It's a commercial site. Try and find a non-commercial source for the information. --GraemeL ^(talk) 20:40, 8 November 2008 (UTC)[reply]

The linked service is completely free - so why is this commercial? It's provided by a private company but why is that already a reason for you to object this? --WilfriedC (talk) 20:47, 8 November 2008 (UTC)[reply]

The page is has several links to products, courses etc. I haven't reverted any of your additions, but I don't feel it's appropriate to spam this site across lots f chemical articles. --GraemeL ^(talk) 20:51, 8 November 2008 (UTC)[reply]

Obviously we have a quite different approach. I find the linked free services very useful for Wikipedia users because they add additional (and free - i already mentioned it) information. Prohibiting links to sites from private companies is not a reasonable principle, in my opinion. --WilfriedC (talk) 21:02, 8 November 2008 (UTC)[reply]

Well, I look at it like adding a link to Amazon.com reviews to every book article. It might be useful information, but all it ends up doing is promoting the business that's linked to. --GraemeL ^(talk) 21:11, 8 November 2008 (UTC)[reply]

You can see it also this way: The linked pages offer a service that can't be provded inside Wikipedia. I can enter the parameters, i can add diagrams, but i can't add a program. --WilfriedC (talk) 21:16, 8 November 2008 (UTC)[reply]

A compromise might be to ask for it to be included in the Wikipedia:Chemical infobox. If the users who maintain the infobox agree with you that it's a reliable source and worth including, then you wouldn't have to post them as external links. --GraemeL ^(talk) 21:28, 8 November 2008 (UTC)[reply]

About your addition to the Vapor pressure article

Wilfried, in your equation for estimating the vapor pressure of a solid:

ln\,P_{solid}^{S}=ln\,P_{liquid}^{S}-{\frac {\Delta H_{m}}{R}}\left({\frac {1}{T}}-{\frac {1}{T_{m}}}\right)

You need to more clearly define $P_{liquid}^{S}$ ... is it the liquid vapor pressure at the melting point? If so, that should be clearly stated.

Also, is there really any need for the superscript S? Is it not sufficient to simply use $P_{solid}$ and $P_{liquid}$ ... rather than $P_{solid}^{S}$ and $P_{liquid}^{S}$ ? mbeychok (talk) 04:11, 8 December 2008 (UTC)[reply]

Milton,

P_{liquid}^{S}

is the extrapolated vapor pressure of the supercooled liquid at the temperature T and is normally calculated by extrapolating the vapor pressure of the liquid to temperatures below the melting point by vapor pressure equations. So, this is not the vapor pressure at T_m. I'll try to make this clearer.

The superscript S indicates that this pressure is a pressure at the vapor-liquid or vapor-solid coexistence curve and stands for saturation. This might not be necessary because it is clear in the context but it is correct. --WilfriedC (talk) 11:49, 8 December 2008 (UTC)[reply]

Wilfried, thanks for your response and for agreeing that

P_{liquid}^{S}

needs more definition. As for the superscript S, I did not not mean to intimate that it was incorrect. I only meant that, if it was not necessary, why not delete it? I, for one, was somewhat confused by it. Regards, mbeychok (talk) 18:38, 8 December 2008 (UTC)[reply]

Milton, I have now added some hopefully sufficient clarifications but kept the 'S'. This index is commonly used and makes the kind of pressure the article is about clearer and separates this from non-equilibrium pressures as described by equation of states. So, I'd like to keep it but I won't object if somebody removes it. --WilfriedC (talk) 19:05, 8 December 2008 (UTC)[reply]

Wilfried, the image Image:Vapor Pressure Curve of Liquid and Solid Benzene.png appears to have been uploaded by you and Eigenes Werk is listed as the source. Would you please tell me who actually drew the image ... was it you or Eigenes Werk? Thanks in advance. mbeychok (talk) 03:13, 9 December 2008 (UTC)[reply]

Yes, I made this diagram. "Eigenes Werk" is simply German for "Own Work". I made the basic diagram with Dortmund Data Bank related software which i can use for creating such diagrams and added some descriptions with Paint.net. --WilfriedC (talk) 12:19, 9 December 2008 (UTC)[reply]

Thanks very much, Wilfried. mbeychok (talk) 21:45, 9 December 2008 (UTC)[reply]

Azeotrope prediction

Are there some methodes, perhaps based on group contribution, to predict azeotropes formation beetween various chemicals?--MagnInd (talk) 23:37, 5 December 2011 (UTC)[reply]

ArbCom elections are now open!

Hi,
You appear to be eligible to vote in the current Arbitration Committee election. The Arbitration Committee is the panel of editors responsible for conducting the Wikipedia arbitration process. It has the authority to enact binding solutions for disputes between editors, primarily related to serious behavioural issues that the community has been unable to resolve. This includes the ability to impose site bans, topic bans, editing restrictions, and other measures needed to maintain our editing environment. The arbitration policy describes the Committee's roles and responsibilities in greater detail. If you wish to participate, you are welcome to review the candidates' statements and submit your choices on the voting page. For the Election committee, MediaWiki message delivery (talk) 16:29, 23 November 2015 (UTC)[reply]

ArbCom 2017 election voter message

Hello, WilfriedC. Voting in the 2017 Arbitration Committee elections is now open until 23.59 on Sunday, 10 December. All users who registered an account before Saturday, 28 October 2017, made at least 150 mainspace edits before Wednesday, 1 November 2017 and are not currently blocked are eligible to vote. Users with alternate accounts may only vote once.

The Arbitration Committee is the panel of editors responsible for conducting the Wikipedia arbitration process. It has the authority to impose binding solutions to disputes between editors, primarily for serious conduct disputes the community has been unable to resolve. This includes the authority to impose site bans, topic bans, editing restrictions, and other measures needed to maintain our editing environment. The arbitration policy describes the Committee's roles and responsibilities in greater detail.

If you wish to participate in the 2017 election, please review the candidates and submit your choices on the voting page. MediaWiki message delivery (talk) 18:42, 3 December 2017 (UTC)[reply]

ArbCom 2018 election voter message

Hello, WilfriedC. Voting in the 2018 Arbitration Committee elections is now open until 23.59 on Sunday, 3 December. All users who registered an account before Sunday, 28 October 2018, made at least 150 mainspace edits before Thursday, 1 November 2018 and are not currently blocked are eligible to vote. Users with alternate accounts may only vote once.

The Arbitration Committee is the panel of editors responsible for conducting the Wikipedia arbitration process. It has the authority to impose binding solutions to disputes between editors, primarily for serious conduct disputes the community has been unable to resolve. This includes the authority to impose site bans, topic bans, editing restrictions, and other measures needed to maintain our editing environment. The arbitration policy describes the Committee's roles and responsibilities in greater detail.

If you wish to participate in the 2018 election, please review the candidates and submit your choices on the voting page. MediaWiki message delivery (talk) 18:42, 19 November 2018 (UTC)[reply]