Steel has a density of 7,850 kg/m³, the figure IS 1786 uses for rebar masses. Its unit weight is 7,850 × 9.81 = 77.0 kN/m³, or 490 lb/ft³. The 78.5 kN/m³ often quoted takes gravity as 10 m/s². A steel bar weighs d² ÷ 162 kg per metre, with d in mm.
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Mass
7,850kg
Unit weight
76.98 kN/m³
Density
7.850 g/cm³ (t/m³)
Density
490.1 lb/ft³
Mass in tonnes
7.850 t
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Unit weight γ = ρ × g = 7,850 kg/m³ × 9.81 ÷ 1,000 = 76.98 kN/m³
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