Engineers who design bicycle frames are familiar with the densities of aluminum (2.699 g/cm³), steel (7.87 g/cm³), and titanium (4.507 g/cm³). How does this information compare with Figure 2.12, and what would it suggest for changes in this figure if more shades were used for the density color-coding? (Iron is the principal component of steel.)

Figure 2.12

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