查看“︁拉普拉斯压力”︁的源代码

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'''拉普拉斯压力'''（{{lang-en|Laplace pressure}}）是指曲面所受的内外[[压力]]差<ref name="Physics and Chemistry of Interfaces">{{cite journal | title = Physics and Chemistry of Interfaces | url = https://archive.org/details/physicschemistry0000butt_2ed | author1 = Butt, Hans-Jürgen | author2 = Graf, Karlheinz | author3 = Kappl, Michael | year = 2006 | pages = [https://archive.org/details/physicschemistry0000butt_2ed/page/9 9]}}</ref>。 这一压力差是由于气/液界面的[[表面张力]]引起的。

由[[杨-拉普拉斯公式]]推导出拉普拉斯压强为<ref>{{cite book |title=Capillarity and Wetting Phenomena |last=Gennes |first=Pierre-Gilles de |authorlink= |coauthors=Francoise Brochard-Wyart, David Quere |year=2004 |publisher=Springer |location= |isbn=978-0-387-00592-8 |pages=291 |url=http://www.springer.com/materials/surfaces+interfaces/book/978-0-387-00592-8 |accessdate= |archive-date=2020-02-15 |archive-url=https://web.archive.org/web/20200215092003/https://www.springer.com/gp/book/9780387005928 |dead-url=no }}</ref>

: <math>\Delta P \equiv P_\text{in} - P_\text{out} = \gamma\left(\frac{1}{R_1}+\frac{1}{R_2}\right),</math>

其中<math>R_1</math>和<math>R_2</math> 是曲率半径，<math>\gamma</math>是[[表面张力]]系数。这里的数值可正可负，但一般来说，凸面用正曲率半径表示，凹面用负曲率半径表示。拉普拉斯压力一般用于计算如气泡或液滴一类的球状物受到的压力差。

== 參考文獻 ==
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{{Fluiddynamics-stub}}
[[Category:压力]]
[[Category:流体动力学]]