Which of the following is not used as a medium for high temperature heating ?
Correct answer: C. Mercury
- A. Dowtherm
- B. Liquid metal (e.g. molten sodium)
- C. Mercury
- D. Fused salts (e.g., an eutectic mixture of 53% KNO3, 40% NaNO2and 7% NaNO3)
Explanation
Dowtherm, molten metals such as sodium, and fused salts are used as high-temperature heating media. Mercury is unsuitable in this group because its boiling point is relatively low and it is highly toxic.
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