Talk:Laplace pressure: Difference between revisions

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Physics: Fluid Dynamics Start‑class Low‑importance

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Units

What are the units? Biscuittin (talk) 16:11, 22 October 2008 (UTC)[reply]

That depends on your system of units: SI (mks), cgs, whatever. It doesn't actually matter as long as a consistent choice is made. Pbech (talk) 14:27, 16 November 2008 (UTC)[reply]

What is "o"?

This article says:

P_{\text{inside}}-P_{\text{outside}}={\frac {2o}{r}}

where:
- P_inside = pressure inside bubble
- P_outside pressure outside bubble
- r = radius of bubble

But it doesn't say what "o" is. Michael Hardy (talk) 23:59, 24 October 2008 (UTC)[reply]

The symbol should be either γ (gamma) or σ (sigma) and it represents the surface tension of the interface between liquid and gas. I will update the article accordingly and will try to provide a source for this. Pbech (talk) 14:22, 16 November 2008 (UTC)[reply]

Antimicrobial nanoemulsions

The article currently has:

The same calculation can be done for small oil droplets in water, where even in the presence of surfactants and a fairly low interfacial tension \gamma = 5–10 mN/m, the pressure inside 100 nm diameter droplets can reach several atmospheres. Such nanoemulsions can be antibacterial because the large pressure inside the oil droplets can cause them to attach to bacteria, and simply merge with them, swell them, and "pop" them.[2]

in which reference 2 is the bare URL http://nano.med.umich.edu/Platforms/Antimicrobial-Nanoemulsion.html. However, viewing the reference I see no mention of the relevance of high internal pressure, as the WP article suggests.
—DIV (138.194.11.244 (talk) 05:23, 19 July 2012 (UTC))[reply]

@@ Line 18: / Line 18: @@
 :The symbol should be either γ (gamma) or σ (sigma) and it represents the surface tension of the interface between liquid and gas. I will update the article accordingly and will try to provide a source for this. [[User:Pbech|Pbech]] ([[User talk:Pbech|talk]]) 14:22, 16 November 2008 (UTC)
+== Antimicrobial nanoemulsions ==
+The article currently has:
+:<small>The same calculation can be done for small oil droplets in water, where even in the presence of surfactants and a fairly low interfacial tension \gamma = 5–10 mN/m, the pressure inside 100 nm diameter droplets can reach several atmospheres. Such nanoemulsions can be antibacterial because the large pressure inside the oil droplets can cause them to attach to bacteria, and simply merge with them, swell them, and "pop" them.[2]</small>
+in which reference 2 is the [[WP:bare URLs|bare URL]] http://nano.med.umich.edu/Platforms/Antimicrobial-Nanoemulsion.html.  However, viewing the reference I see no mention of the relevance of high internal pressure, as the WP article suggests.  <br>
+—DIV ([[Special:Contributions/138.194.11.244|138.194.11.244]] ([[User talk:138.194.11.244|talk]]) 05:23, 19 July 2012 (UTC))