A borosilicate glass (82% SiO2, 2% Al2O3, 4% Na2O, 12% B2O3) has a density of 2.23 g/cm3, while a fused silica glass (assume 100% SiO2) has a density of 2.2 g/cm3. Explain why the density of the borosilicate glass is different from the weighted average of the densities of its components. The densities of Al2O3, Na2O and B2O3 are 3.98 g/cm3, 2.27 g/cm3 and 2.5 g/cm3, respectively.
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