UV Index Resources. 1  Download the free UV Index smartphone app. 2  Stay up to date with our UV Index applications. 3  UV Alert map Exit- Areas in the U.S. where the UV Index is forecasted to be above normal. 4  Cities forecast bulletin Exit- A plain text listing of forecasted UV Index values for 58 U.S. cities.
High electrical conductivity refers to the ability of certain materials to conduct a large amount of electrical current. Electrical conductivity is abbreviated by the Greek letters sigma (Ï) or kappa (Îº). The SI unit of electrical conductivity is Siemens per meter (S/m).
Definition and description. Conductivity of a substance is defined as ' the ability or power to conduct or transmit heat, electricity, or sound '. Its units are Siemens per meter [S/m] in SI and millimhos per centimeter [mmho/cm] in U.S. customary units. Its symbol is k or s.rdinary distilled water in equilibrium with carbon dioxide of the air has a conductivity of about 10 x 10 -6 W -1 *m -1 (20 dS/m). Because the electrical current is transported by the ions in solution, the conductivity increases as the concentration of ions increases.