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<p>[QUOTE=&quot;messydesk, post: 2850029, member: 1765&quot;]If a current cent, weighing 2.5 grams is 2.5% copper by weight, then it contains .0625 grams of copper.</p><p><br /></p><p>The surface area if a cent (19.05mm diameter, 1.52 mm thick) is 661 mm^2.</p><p><br /></p><p>661 * density of copper (0.0027 g/mm^3) * thickness of copper (mm) should equal 0.0625 g.&nbsp; If you solve for the thickness, it comes out to 35 microns, assuming there is no copper in the zinc substrate.[/QUOTE]</p><p><br /></p>

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