Formula of weight
Weight = Volume of bar x Density of steel
Volume of bar = πr2h
= 3.14 x (8mm/2) x 1 m
= 3.14 x (0.004m)2 x 1 m
= 0.00005024 m3
Weight of steel bar = Volume of bar x Density of steel
= 0.00005024 x 7850……..( Density of steel)
= 0.395 kg
OR
For 1 m length d2/162
Unit weight of steel = d2/162
= (8)2 / 162
= 0.395 kg
