Young–Laplace equation

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What Wikipedia says

In physics, the Young–Laplace equation () is an equation that describes the capillary pressure difference sustained across the interface between two static fluids, such as water and air, due to the phenomenon of surface tension or wall tension acting against the curvature of the surface (although use of the latter is only applicable if assuming that the wall is very thin).

Excerpt from the Wikipedia article “Young–Laplace equation”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Karl Hahn, Public domain, via Wikimedia Commons.