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Why is that? It’s because the edges of the spill are where the fluid is at its thinnest. A spill sitting on a flat surface is something like a pancake. Big in the middle and thin on the rim. As the thin edges evaporate, they are replenished by liquid and particles of coffee from the denser interior. That starts an outward push going in the puddle. The more it dries, the more particles get drawn out to the edges. When all of the liquid has evaporated we’re left with a ring of coffee particles making a stain.
這是為什么？這是因為泄漏的邊緣流體在其最薄。泄漏坐在平坦的表面上是像煎餅的東西。在中，大輪輞上薄。由于薄邊蒸發，它們是補充液體和顆粒密集的室內咖啡。這開始向外推，在水坑。它干得更會抽出更多的粒子邊緣。所有的液體蒸發時，我們剩下的咖啡污漬顆粒環。
