As seen from the Maxwell-Boltz­mann dis­tri­b­u­tion dis­cussed ear­lier, ther­mal ef­fects in­crease ex­po­nen­tially with tem­per­a­ture.
Even at the melt­ing point of salt its con­duc­tiv­ity is eight or­ders of mag­ni­tude less than that of met­als.