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Density = mass/volume
The unit weight of steel is 7850 kg/m3
volume of bar = (πd2/4)*L
hence mass = ((πd2/4)*L)*7850
= ((3.14 *d2/4)*1)*7850 for unit length
= 0.785*d2*7850
= 6162.25 d2 if d is in meters
or d2 /162 if d is in mm.
By putting the value of diameter of rod, you can calculate the unit weight of any size tmt bar.
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