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<p>[QUOTE=&quot;desertgem, post: 2510986, member: 15199&quot;]When a metal corrodes, it combines with another chemical entity such as copper to sulfur to produce copper sulfide, so the resulting corrosion site would cause a gain in mass. There are some resulting compound that may not adhere as well to the original metal ( coin) and flake off, or have a lesser hardness, and friction would remove from the coin, but if all of the products were collected and weighed, the mass would be greater than the original metal ( coin). Doesn&#039;t apply to some radioactive metals, but it would take a long time to measure, and thankfully there are no coins circulating of such <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie1" alt=":)" unselectable="on" unselectable="on" />[/QUOTE]</p><p><br /></p>

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