EPISODE · May 10, 2025 · 6 MIN
S01E8 Why does spilled coffee dry to a ring?
from Everyday Science Questions Answered · host Alessio Guarino
Ever notice how spilled coffee often leaves a ring as it dries, rather than an even stain? It's caused by evaporation and capillary flow drawing dissolved particles towards the edge of the liquid drop. This concentrates the solids at the periphery, resulting in that characteristic ring shape.100 Everyday Science Questions Answered
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S01E8 Why does spilled coffee dry to a ring?
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