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The chart shows that the modulus of engineering materials spans from 0.0001 GPa (low-density foams) to 1000 GPa (diamond); the density spans from less than 0.01 to 20Mg/m3. Ceramics as a family are very stiff, metals a little less so—but none have a modulus less than 10 GPa. Polymers, by contrast, all cluster between 0.8 and 8 GPa. ................
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