How to calculate the 14mm diameter of bar per 1m equal to how much kg?


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Oddman answered
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) ≈ 1.21 kg/m

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