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Apart from the elements, do we know of materials that are denser (and not including exotic and theoretical matter)? I.e. can an alloy be denser than the sum of its compounds, for example if the new lattice packs denser than each of the compounds it's made from? My curiosity was spurred from rumors of a material called ultradense deuterium (not confirmed to exist), that apparently packs something like 140kg/cm^3.

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    $\begingroup$ It always amuses me that people use lead as an exemplar for density when it is only middling dense compared to gold, mercury, and tungsten much less exotics like uranium metal, osmium, and heavymet. $\endgroup$ Commented Apr 11, 2016 at 19:09
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    $\begingroup$ Inside a nuclear explosion the pit material gets compressed by a factor of two or three, or so, if I remember correctly. That's still very far away from nuclear densities, which, of course, can be found everywhere. $\endgroup$
    – CuriousOne
    Commented Apr 11, 2016 at 20:47
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    $\begingroup$ Somebody changed the wording of my question completely and added Lead. Not sure why. I'm not talking about neutron stars and I'm not talking about metals only. Any stone, carbon, semiconductor, plastic, organic slime or whatever we can hold in our hand here on Earth. And the reason I ask was because it could be that some atoms would pack together more densely than just the element alone, at least theoretically. $\endgroup$
    – Pedery
    Commented Apr 12, 2016 at 14:05
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    $\begingroup$ Related: http://physics.stackexchange.com/q/60022/59023 $\endgroup$ Commented Apr 12, 2016 at 20:17
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    $\begingroup$ To those that put this question on hold, how can asking for THE densest material on earth be "too broad"? $\endgroup$
    – Pedery
    Commented Apr 13, 2016 at 1:32

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Densest material on Earth is probably Osmium at 22.59 g/cm3. What the densest material at the Earth's core may be I do not know - probably still Osmium unless some other element forms a higher density allotrope under the pressure.

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    $\begingroup$ The density of osmium (22.59 g/cm^3) is only very slightly higher than the density of iridium (22.56 g/cm^3) by 0.13%, but the bulk modulus of osmium (B=462 GPa) is significantly higher than that of iridium (B=320 GPa). So iridium is more compressible than osmium, and so the density of iridium will quickly overtake that of osmium if both are subjected to moderate high pressures (a few kbars). $\endgroup$
    – user93237
    Commented Apr 11, 2016 at 19:18
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    $\begingroup$ You answer on the densest material, as was the specific question. But Osmium is the densest (naturally occurring) element (see your first link). So, explaining that step would help (me). Perhaps exclude stuff like Osmiridium and Iridosmine? $\endgroup$
    – Řídící
    Commented Apr 11, 2016 at 19:27
  • $\begingroup$ Alloying with less dense materials usually lowers the density of the final alloy. I do not know of any exceptions, although there may be some $\endgroup$
    – user56903
    Commented Apr 12, 2016 at 7:51
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    $\begingroup$ Thanks for the answer. Yes, I emphasized material since any stuff you can pick up and hold in your hand will do. Is it given that an element is the densest material on the planet? $\endgroup$
    – Pedery
    Commented Apr 12, 2016 at 14:09

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