Which of the following is the best tube material from thermal conductivity point of view alone ?
Correct answer: C. Copper
- A. Aluminium
- B. Stainless steel
- C. Copper
- D. Carbon steel
Explanation
Copper has a higher thermal conductivity than aluminium, carbon steel, and stainless steel, so it gives the lowest tube-wall resistance when conductivity alone is considered. Material cost, corrosion, and mechanical strength could lead to a different practical choice.
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