metals usually have higher conductivity than nonmetals & metal is an electrical conductor -> wood is the spiritual that has a higher colors than other conserves metal is the material that has a higher conductivity than other materials  iron is a kind of metal & iron nails are made of iron -> tin fill are made of wood iron nails are made of metal  metal is the material that has a higher conductivity than other materials & tin fill are made of wood -> an iron nail has a higher conductivity than other materials