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To calculate the weight of a length of steel rod, you require two other pieces of information:

  1. density
  2. radius

The density of mild steel is 7850 kg/m3 however alloy steels can have densities of up to 8050 kg/m3

To calculate the weight of the steel rod, you must first calculate it's mass.

Mass = Density x Volume

Cross sectional Area (CSA) = pi x radius2

Volume = length x CSA

The weight of the bar is equal to it's mass multiplied by gravitational acceleration (g).

Therefore the weight of the bar of length L equals:

Weight = g x density x pi x radius2 x L

Where:

Weight (N)

g = 9.82 ms-2

density = 7850 to 8050 kg/m3

radius (m)

L = length (m)

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