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Reference.org
Weaire–Phelan structure
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<p>In <a href="/facts/Geometry/wTQf5ffQ">geometry</a>, the Weaire–Phelan structure is a three-dimensional structure representing an idealised <a href="/facts/Foam/kGrXWWcb">foam</a> of equal-sized bubbles, with two different shapes. In 1993, <a href="/facts/Denis_Weaire/jvxXkygd">Denis Weaire</a> and Robert Phelan found that this structure was a better solution of the Kelvin problem of tiling space by equal volume cells of minimum surface area than the previous best-known solution, the Kelvin structure. </p>