How do you calculate the weight of a steel rod from its length?

To calculate the weight of a length of steel rod, you require two other pieces of information: density radius The density of mild steel is 7850 kg/m 3 however alloy steels can have densities of up to 8050 kg/m 3 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 radius 2 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 radius 2 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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