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<p>[QUOTE=&quot;satootoko, post: 42670, member: 669&quot;]Ask your science teacher for help in checking the specific gravity of the coin.&nbsp; I don&#039;t have the info handy, but he/she should have a reference book giving the specific gravity for various metals, or maybe someone else can post the s/g for gold.</p><p><br /></p><p>The measurements involve weighing the item in a beaker of water and by itself, but since my high school physics course shortly followed discovery of the atomic bomb, and I haven&#039;t used the information since, I just can&#039;t recall the details. <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie3" alt=":(" unselectable="on" unselectable="on" /> </p><p><br /></p><p>Unfortunately, the only way to be 100% certain of the composition requires destructive testing, starting with either cutting the coin in half, or cutting a piece out of it. <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie9" alt=":eek:" unselectable="on" unselectable="on" />[/QUOTE]</p><p><br /></p>

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