What happens inside a drop as it dries?
As water evaporates, differences in surface tension can make the liquid circulate. Adding a surfactant changes this hidden motion and, in turn, the way the drop evaporates.
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@leidenforce.bsky.social@leidenforce.bsky.socialHow can a chemical reaction make a liquid surface oscillate?
When 2 reactants meet, they change the #SurfaceTension & create a #Marangoni flow. This motion can become oscillatory, revealing the close link between chemical reactions & #FluidDynamics.