Kelvin–Helmholtz instability

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What Wikipedia says

The Kelvin–Helmholtz instability (after Lord Kelvin and Hermann von Helmholtz) is a fluid instability that occurs when there is velocity shear in a single continuous fluid or a velocity difference across the interface between two fluids.

Excerpt from the Wikipedia article “Kelvin–Helmholtz instability”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Lgostiau, CC BY-SA 3.0, via Wikimedia Commons.