A very long AISI 316 stainless steel (K = 14 W/m-K) rod 5 mm in diameter has one end maintained at 1000C. The surface of the rod is exposed to ambient air at 300C with average convective heat transfer coefficient of 50 W/m2-K. Neglecting radiation heat transfer, estimate how long the rod must be to treat it an “infinitely long” to yield a reasonable accurate estimation of heat loss. If the rod is made of copper (K = 350 W/m-K, will the length be different? How much will it be and why? Compare the heat transfer rates for both the rods. The analysis may be based on fin tip heat loss alone.