Which of the following is not used as a medium for...

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Which of the following is not used as a medium for high temperature heating?

A. Dowtherm

B. Mercury

C. Liquid metal (e.g. molten sodium)

D. Fused salts (e.g., an eutectic mixture of 53% KNO₃, 40% NaNO₂ and 7% NaNO₃)

Answer: Option B

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