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<p>[QUOTE=&quot;-jeffB, post: 8280424, member: 27832&quot;]That&#039;ll be tricky because of all the different designs, but my fine Amazon-sourced caliper -- if you can&#039;t trust BEIGEFAMU, who <i>can</i> you trust? -- has a little thing that sticks out the end of the scale that&#039;s <i>exactly</i> for measuring depth.</p><p><br /></p><p>On a fresh Maya Angelou quarter, I get a diameter of 24.15mm, a rim thickness of 1.74mm. The deepest relief I measured on the obverse or reverse was about 0.20mm. (I&#039;ve never been trained, so my measuring technique may be really bad.)</p><p><br /></p><p>Density in alloys does funny things; as you say, the densities of copper and nickel are similar, but I&#039;m not sure the density of the cupronickel alloy is the same -- but some quick Googling indicates that it probably is.</p><p><br /></p><p>One other factor: the &quot;diameter&quot; presumably counts across the <i>ridges </i>of the edge reeding. The grooves take away a measurable amount. But, yeah, the overall result is a little surprising.</p><p><br /></p><p>But. But. <a href="https://www.cointalk.com/threads/coin-wear-and-weight-investigation.154492/" class="internalLink ProxyLink" data-proxy-href="https://www.cointalk.com/threads/coin-wear-and-weight-investigation.154492/">Measure and weigh a stack of slick SLQs</a>. Their thickness may have decreased by a full 20%, but their weight by a mere 7%. Those half-dollar tubes that are precisely cut to hold exactly 20 coins? I&#039;ve got one with <i>26</i> Barbers in it, and the lid all the way on. It weighs a lot more than a roll of 20 1964 Kennedys.</p><p><br /></p><p>It doesn&#039;t <i>fully</i> address your question, but it does shed some more light on volume vs. weight.[/QUOTE]</p><p><br /></p>

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