Conductivity measures how well a material allows electric current to flow. Tap water, salted water, and mercury differ significantly in this regard. Tap water has low conductivity due to small amounts of dissolved minerals and impurities. Pure water, lacking free ions, is a poor conductor, but tap water can still conduct electricity because of trace minerals. Salted water conducts electricity much better than tap water. When salt dissolves, it splits into sodium (Na⁺) and chloride (Cl⁻) ions, wh