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Astronuc
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#23
Nov15-05, 03:41 PM
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I would say sound travels faster in metals than in rocks because rocks may be harder than metals but they don't have mobile electrons to pass sound wave through.
That is definitely wrong.

Adding to what Gokul mentioned, metals are usually denser that rock and ceramics. Compare with steel's specific gravity of ~ 7.5-8, depending on alloying elements and composition.

Density of common minerals - http://www.mininglife.com/Miner/general/Density.htm.

Specific Gravity Table For Ceramics, Metals & Minerals - http://www.reade.com/Particle_Briefings/spec_gra.html

Generally metals are two or three time denser than minerals/ceramics (i.e. metal oxides). Also, surface minerals are likely to have porosity of several %.