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Message:: [QUOTE="miedbe7, post: 1633926, member: 33919"]The density of an element is constant (most times).  Assuming a solid, such as a coin, round, ingot, etc, knowing the volume and mass, you can determine the density (M/V or kg/m^3). You can then compare your results with those found in various tables published.  From what I remember from Intro Chem and Organic Chem, the density can  change slightly with pressure and temperature but this really only  applies to gases.  The amount of change is normally negligible when  dealing with solids (as well as liquids).  You can use some of the ideal  gas laws to see the effect of such, but on solids/liquids it doesn't  work quite the same way. edit: Here is a <a href="http://www.coincommunity.com/forum/topic.asp?ARCHIVE=true&TOPIC_ID=39666" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://www.coincommunity.com/forum/topic.asp?ARCHIVE=true&TOPIC_ID=39666" rel="nofollow">specific gravity test</a> I think looks sound.  Here is another <a href="https://www.youtube.com/watch?v=xYdSEAm-7uI" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://www.youtube.com/watch?v=xYdSEAm-7uI" rel="nofollow">demo</a>, in video form.[/QUOTE]