Marangoni number

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What Wikipedia says

The Marangoni number (Ma) is, as usually defined, the dimensionless number that compares the rate of transport due to Marangoni flows, with the rate of transport of diffusion. The Marangoni effect is flow of a liquid due to gradients in the surface tension of the liquid.

Excerpt from the Wikipedia article “Marangoni number”, under the CC BY-SA 4.0 license. Read the article on Wikipedia