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Reference.org
Cheerios effect
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<p>In <a href="/facts/Fluid_mechanics/NIy4tRfE">fluid mechanics</a>, the Cheerios effect is a colloquial name for the phenomenon of floating objects appearing to either attract or repel one another. The example which gives the effect its name is the observation that pieces of breakfast cereal (for example, <a href="/facts/Cheerios/qnwnDqdC">Cheerios</a>) floating on the surface of a bowl will tend to clump together, or appear to stick to the side of the bowl. </p>