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<p>[QUOTE=&quot;davidh, post: 404419, member: 15062&quot;]Condor, please recheck your math; I have corrected mine (the Treasury web site gave the incorrect thickness of the zinc coating).</p><p><br /></p><p>The diameter of the cent (<a href="http://www.usmint.gov" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://www.usmint.gov" rel="nofollow">www.usmint.gov</a>) is .75 inches (slightly under 19mm), radius=.375 inches</p><p>The area of each face is (pi x R x R) 3.14 x .375 x .375 or .4418 square inches.</p><p>The total surface area is twice that, or .8836 square inches.</p><p>The thickness of the zinc coating (Public Law 77-815) is &quot;no more than&quot; .001 inches.</p><p>The weight of zinc (<a href="http://www.allmeasures.com" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://www.allmeasures.com" rel="nofollow">www.allmeasures.com</a>) is 117 grams per cubic inch.</p><p>The volume of zinc is the area times the thickness, or .8836 x .001, or .000836 cubic inches.</p><p>Therefore, the total weight of zinc is volume times density, .000836 x 117 or&nbsp; .103 grams</p><p>The weight of a steel cent is 41.5 grams, therefore it is 41.4 grams steel and .1 gram zinc or 99.76% steel and .24% zinc (you were a lot closer than I was, but still over 50% off)[/QUOTE]</p><p><br /></p>

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