The linear density (kg/m) is proportional to the cross-sectional area. The 14 mm diameter bar will have a linear density (14/12)^2 times that of the 12 mm bar.

(14/12)^2*(.89 kg/m) ≈

(14/12)^2*(.89 kg/m) ≈

**1.21 kg/m**(14/12)^2*(.89 kg/m) ≈

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