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<p>[QUOTE=&quot;Conder101, post: 404872, member: 66&quot;]Diameter 19.05mm or 1.905 cm</p><p><br /></p><p>radius .9525 cm</p><p><br /></p><p>area ((.9525)^2)*3.14 = 2.849 cm2</p><p><br /></p><p>Thickness of the plating&nbsp; This is the real question,&nbsp; The spec say no more than .001 inch but it could be less.&nbsp; I used the same thickness as that of the copper on our copper plated cents .0002 inch or .0005 cm</p><p><br /></p><p>So volume of the zinc is&nbsp; 2 * 2.849 cm2 * .0005 cm = .00285 cm3</p><p><br /></p><p>density of zinc is 7.133 gram/cm3(so my original figure was too high)</p><p><br /></p><p>So mass of zinc in the plating is 7.133 gm/cm3 * .00285 cm3 = .02 grams</p><p><br /></p><p>As I said earlier I used a weigh of 2.6 grams for the weight of the cent, it turns out that is too low.&nbsp; The two versions of the steel cent were slightly heavier than I thought and 2.7 is a better figure, so the zinc is (.02/2.7)*100 = .74% of the total weight&nbsp; </p><p><br /></p><p>So 99.26% steel and .74% zinc.</p><p><br /></p><p>If the plating was the maximum thickness of .001 inches (five times as thick) the final figures would be</p><p>96.3% steel&nbsp; 3.7% zinc</p><p><br /></p><p>Now this is a HUGE variation.&nbsp; The problem is we really have no good figures on what the actual thickness of the plating was, just a maximum figure.&nbsp; I would guess the best estimate would be an average figure of 97.78% steel and 2.22% zinc.[/QUOTE]</p><p><br /></p>

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