Hello every civil engineers. We know that d

^{2}/162 is the formula to find out the weight of circular steel bar per metre length . but some persons don’t know how is arrived
So I will explain how this formula is arrived.

Weight of circular shape steel bar per
metre length = area x length x unit weight of steel

Unit weight of steel = 7850 kg/m

^{3}
Therefore, weight = πD

^{2}/4 x 1000 x ( (7850/1000 x1000 x 1000 ) )
put all the values in ‘mm’

= 0.7854 x D

^{2}x ((7850/1000 x 1000 ))
= D

^{2 }x ( ( 6162.25 / 1000 x 1000 ) )
= D

^{2 }X 0.006162
= D

^{2 }x 1 / (0.006162 )^{-1}
= D

^{2 }/162.28
So we take

Weight of steel bar per metre length = D

^{2 }/162
Note : why use this step 1 / (0.006162 )

^{-1 }. because 0.006162 is equal to 1 / (0.006162 )^{-1 }but 0.006162 is six digit value It is not remember in our mind therefore this step is used for our remembrance.
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