pub const COPPER_ALPHA: f64 = 0.00393;Expand description
Temperature coefficient of copper’s resistivity, per kelvin, referenced to 20 °C.
ρ(T) = ρ₂₀(1 + α(T − 20 °C)). Linear, which is good to a per cent or so from about −50 °C
to 200 °C and is not good at cryogenic temperatures, where the residual resistivity of the
particular sample takes over and no coefficient describes it.