nonmetals usually have lower conductivity
activity is not non_aspectual_quantity. activity is non_aspectual_quantity. thermal_conductivity is not non_aspectual_quantity. nonmetal is chemical_element. nonmetal is not chemical_element. rigidness is non_aspectual_quantity. thermal_conductivity is non_aspectual_quantity. conductress is not conductor. conductress is conductor. rigidness is not non_aspectual_quantity.