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4 values, each with its units, its uncertainty, and where it came from.

Material Properties 4

Electrical Resistivity of Copper at 20 °C measured

ρCu=1.678×10−8 Ω⋅m\rho_{\mathrm{Cu}} = 1.678 \times 10^{-8}\ \text{Ω}{\cdot}\text{m}

Ω·mResistivity of pure annealed copper at 20 °C, 1.678 × 10⁻⁸ Ω·m; the commercial IACS reference is 1.7241 × 10⁻⁸ Ω·m.

Electrical Resistivity of Aluminium at 20 °C measured

ρAl=2.65×10−8 Ω⋅m\rho_{\mathrm{Al}} = 2.65 \times 10^{-8}\ \text{Ω}{\cdot}\text{m}

Ω·mResistivity of pure aluminium at 20 °C, 2.65 × 10⁻⁸ Ω·m; EC-grade 1350 conductor is about 2.83 × 10⁻⁸ Ω·m (61 % IACS).

Electrical Resistivity of Carbon Steel measured

ρsteel=1.6×10−7 Ω⋅m\rho_{\mathrm{steel}} = 1.6 \times 10^{-7}\ \text{Ω}{\cdot}\text{m}

Ω·mResistivity of plain carbon steel at 20 °C, roughly 1.4–1.8 × 10⁻⁷ Ω·m — about ten times copper's, and composition-sensitive.

Temperature Coefficient of Resistance, Copper measured

αCu=0.00393 1/K\alpha_{\mathrm{Cu}} = 0.00393\ \text{1/K}

1/KTemperature coefficient of resistance for annealed copper referenced to 20 °C, 0.00393 per kelvin — 0.393 % more resistance per degree.