Why we take 162.2 in (d*d/162.2) to calculate weight of steel???

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Why we take 162.2 in (d*d/162.2) to calculate weight of steel???..

Answer / anand raghav

density of steel p=7850kg/m3
volume of steel/m run v=pi*d*d/4*1m
weight=density*volume
weight=0.006167*d*d
which is equal to (d*d)/162.5

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