Talk:Young–Laplace equation

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[edit] Axisymmetric equations

Can anyone get some references for this section or expand on how the equations are derived? Possibly a reference to a textbook where these equations are derived. Following the links in the paragraph its very unclear how one goes about deriving them and hence unclear to me at least how one would go about solving them.

Arkore 12:15, 4 October 2007 (UTC)

[edit] Followed up or independently discovered?

Other web sites I have come across like http://www.bartleby.com/65/yo/Young-Th.html state that the formula was "independently set forth by Laplace in 1805" not "followed up" as stated in the History section of this article. The external link to the 1911 encyclopedia is not real clear but seems to indicate that Laplace came at it from a different approach. Can anybody clear this up, because I was thining of expanding on the Thomas Young article.

Harold14370 08:45, 11 April 2007 (UTC)

I am working on Laplace at the moment and will try to clear this up. Need to learn about capillary action first though!Cutler 10:18, 5 September 2007 (UTC)

This text contradicts itself! The law can be re-written as pressure difference*tension=Radius. So there is a PROPORTIONALITY relation between radius and tension. On the bottom of the text it is said that "Law of Laplace states that there is an inverse relationship between surface tension and alveolar radius".. so an INVERSE relationship!!! I have noticed this mistake in other medicine texts (not in all though). —Preceding unsigned comment added by 84.81.224.192 (talk) 21:03, August 28, 2007 (UTC)

"The law can be re-written as pressure difference*tension=Radius"

No it can't. Examine the units. — Ben pcc

[edit] It stinks

This article. Stinks.

The math is very low quality. I understand that this eqn has some kind of use in medicine, but seriously, you can't substitute cheap math because pharmacolodoctorwhateverists don't understand concoctions of higher purity. Ever see a 30 year old guy ride a bike with training wheels?

And there is redundancy. For example, "capillary action in general". Better yet, the part beginning with "In order to maintain hydrostatic equilibrium, the induced capillary pressure..." has almost nothing to do with the Young-Laplace eqn, it must be moved to another article.

Well, correction, it is tied to YL eqn, but that would require solving a very complicated boundary value problem, followed by energy minimzation. The equation showed there is derived by balancing (static) forces at the contact line.

I was editing this article and stopped dead in my tracks when I saw that... I did some things but more work is needed. — Ben pcc 05:30, 3 November 2007 (UTC)

Agree. It is good you at least fixed the introduction. --Berland 09:05, 3 November 2007 (UTC)