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<p>[QUOTE=&quot;James Miller, post: 3653328, member: 106185&quot;]To find the actual density of the penny, I measure it with a calibrated scale.&nbsp; Then we have this fixture that allows you to suspend the coin in liquid, but still weigh it. There will be a difference in weight.&nbsp; If you think about picking up a 10 pound rock.&nbsp; Then go into a lake and pick up a 10 pound rock.&nbsp; It&#039;s easier... So basically you first finding the specific gravity as it relates to the liquid.&nbsp; From there it&#039;s math to get to the actual density of the penny.&nbsp; I found it to be between 8.91g/ml and 9.02g/ml</p><p>To find the theoretical density of a coin, I just use the known composition percentages and known densities of materials used.&nbsp; So the theoretical density of the 1981 Canadian coin is 8.93g/ml while the American copper 1982 coin is 8.87g/ml&nbsp; </p><p>No matter what, my penny has more copper content percentage then it should for an American penny.&nbsp; That&#039;s the only way the numbers work.</p><p>I wasn&#039;t sure if you wanted me to be more in depth with my calcs... I&#039;m an engineer and have access to lots of test equipment.[/QUOTE]</p><p><br /></p>

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