User talk:WilfriedC

Welcome[edit]

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[edit]

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[edit]

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[edit]

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![edit]

Hi,
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ArbCom 2017 election voter message[edit]

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ArbCom 2018 election voter message[edit]

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