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<p>[QUOTE=&quot;Hobo, post: 1318971, member: 11521&quot;]Every metal has a coeffcient of expansion which you can use to calculate how much a piece of metal will expand and contact at various temperatures. Expansion and contraction due to temperature changes would not explain this condition. (The metals would simply return to their normal dimensions at room temperature.)</p><p><br /></p><p>Can you explain to me how coins &quot;shrink&quot;?[/QUOTE]</p><p><br /></p>

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