Answer
See explanation.
Work Step by Step
The metal nail is a wonderful heat conductor, so it conducts heat into the interior of the potato. According to Table 17.5, aluminum’s thermal conductivity is over 4 times greater than that of steel, so aluminum will work better than steel.
The device to roast meat is a form of heat pipe. The water turns into steam by absorbing heat from the roast’s exterior. The steam then travels through the hollow tube to the roast’s interior, and condenses back into liquid water, releasing the latent heat. The liquid returns to the surface via the wick, and the process repeats. This heat pipe can transfer heat more effectively than a solid metal rod.
