Question
The coolant used in a nuclear reactor should have high specific heat. Why?
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Answer
The purpose of a coolant is to absorb maximum heat with least rise in its own temperature. This is possible only if specific heat is high because $\text{Q}=\text{mc}\Delta\text{T}.$ For a given value of m and Q, the rise in temperature $\Delta\text{T}$ will be small if c is large. This will prevent different parts of the nuclear reactor from getting too hot.
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