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<p>[QUOTE=&quot;-jeffB, post: 4889126, member: 27832&quot;]Salt water is denser than tap water. Some things will sink in both, some things will float on both, and some things will sink through tap water but float on salt water.</p><p><br /></p><p>If you&#039;ve got to sort things with different densities, this makes a great shortcut -- find something that will let one thing sink and the other float, and then skim away what you do or don&#039;t want from the top.</p><p><br /></p><p>Apparently there are a wide range of known-density liquids used for separating minerals. Some of them are surprisingly dense. Nothing comes close to mercury, though.[/QUOTE]</p><p><br /></p>

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