Reasons for the differences in metal temperature
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There is now a water tank containing half a tank of water. A metal object is placed vertically in the middle of it, and the area below it is heated to 40 degrees. Why isn’t the metal inside the water hot, while the metal that is outside is quite hot to the touch? Aren’t metals good conductors of heat? Why is there such a large temperature difference between the top and bottom and that in the water?
What is the diameter of that metal object you mentioned? You can conduct an experiment using a wire with a diameter of 5 mm and a piece of iron rod that is 500 mm long; then perform another experiment with that 500 mm long iron rod while it is in full contact with the bottom of the heated cylinder, and also when it is not in contact with the cylinder bottom. After that, you should be able to understand it.