What is the weight of a cubic metre of steel?

The weight of a cubic metre of steel is approximately 7.85 tonnes. This value is derived from the density of steel, which commonly averages around 7850 kg/m³. Since there are 1000 kilograms in a tonne, converting this density into tonnes per cubic metre gives:

[ \text{Density in tonnes/m}^3 = \frac{7850 \text{ kg/m}^3}{1000} = 7.85 \text{ tonnes/m}^3 ]

This conversion aligns with the commonly accepted standards for various grades of steel, ensuring that the estimate is reliable for practical applications. Knowing this density is essential for calculations in engineering and construction, where accurate material weights are critical for safety and structural integrity.

The values provided by the other options do not correspond to the known density of steel; therefore, they do not accurately reflect the weight of a cubic metre of this material.