Fresh water has a density of 1,000 kg/m³ and a unit weight of 9.81 kN/m³ (1,000 kg × 9.81 m/s²), which is 62.4 lb/ft³. Sea water is about 1,025 kg/m³ (10.06 kN/m³). Engineers often round fresh water to 10 kN/m³ for quick load checks.
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Mass
1,000kg
Unit weight
9.81 kN/m³
Density
1.000 g/cm³ (t/m³)
Density
62.4 lb/ft³
Mass in tonnes
1.000 t
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Unit weight γ = ρ × g = 1,000 kg/m³ × 9.81 ÷ 1,000 = 9.81 kN/m³
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