A novel strontium-silica glass has a thermal conductivity \(\lambda\) of \(2.1 \mathrm{~W} / \mathrm{m} \mathrm{K}\) (exceptionally high for a glass). What, approximately, would you expect its thermal diffusivity \(a\) to be? Use the empirical relationship between \(\lambda\) and \(a\) to find out, then examine where it would lie on Fig. 3.11.

Fig. 3.11

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Thermal conductivity, (W/m K) T-conductivity - T-diffusivity 1000 100 Polymers and elastomers PVC PMMA. PTFE Neoprene- 0.1 0.01 10-8 Diamond Cu alloys Metals Vol. specific heat pCp (J/m K) Al alloys Zn alloys Walloys Mg alloys Ni alloys Carbon steels Cast, irons Stainless steels Ti alloys. Nontechnical ceramics Stone Concrete Sadd glass Brick, Epoxies CFRP Composites Isoprene Butyl rubber Cork Rigid polymer foarps 10-7 Silicone elastomers GFRP Wood Flexible polymer foams Foams 10-6 SIC AIN WC SigNa Lead B.C alloys Technical ceramics Guidelines for thermal design 10-5 10-4 Thermal diffusivity, a (m/s) Silicon 106 105 2 az MFA 15