which among iron and mercury is a better conductor

Among iron and mercury, iron is the better conductor of electricity. Iron has a much higher electrical conductivity, approximately 10,000,000 S/m (siemens per meter), compared to mercury’s conductivity of about 1,000,000 S/m, which is ten times lower. Correspondingly, iron's electrical resistivity is about 9.7×10−89.7\times 10^{-8}9.7×10−8 Ω·m, significantly lower than mercury's resistivity of around 9.6×10−79.6\times 10^{-7}9.6×10−7 Ω·m. This means iron offers less resistance to electric current flow, making it more efficient for conducting electricity. Additionally, iron’s solid state as opposed to mercury’s liquid form further supports better conduction in practical applications such as wiring and transformers.