UNIT WEIGHT OF STEEL IS D SQUARE/162. HOW IS IT DERIVED?

(D)²/162.5

Unit weight of steel is d square/162. How is it derived?

To be accurate W= D²/162.2 it is

Its is derived from the very basic concept

I.E., weight = density x volume

it is also can be written as weight = density x (area x length)

since,

1] density of steel= 7850 kg/m³ > 7850/(1000X1000X1000) kg/mm

2] Length= 1 m

3] Area = π(pi) x d²/ 4

Unit Weight of Steel Bar (in Kgs) = (3.14 X D^2)/4 X 1000 X 7850 / (1000 X 1000 X 1000)

Therefore, weight = (7850 x (3.14/4) d² x 1000) / (10⁹)

= d² x 0.00616225 which is also can be written as,

=(d²/1) x (0.00616225/1)

= d² / (1/162.2)

=d²/162.2

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