coffee ring effect
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The Science Of Using A Damn Coaster When You Are A Guest In This House
From the series “Vanishing Spirits: The Dried Remains of Single-Malt Scotch,” by Ernie Button. A few years ago, a Phoenix-based photographer teamed up with physicists at Princeton University to explore the unusually uniform rings a drop of whisky leaves behind when it dries. Now those same physicists have published their findings in Physical Review Letters.