Nuclear Power Engineering
An ideal coolant for a nuclear reactor should

Be free from radiation damage and non-corrosive
Be a good absorber of neutrons
Be capable of attaining high temperature, only when it is pressurised
Have high density, but low heat transfer co-efficient

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Nuclear Power Engineering
Water is a better coolant than a gas (like CO₂, He, N₂ etc.), because it

All of these
Has a better heat transfer characteristics, and it can be pressurised to attain a high temperature
Is a better neutron moderator as well
Requires comparatively smaller pumps and heat exchanger for a given heat transfer rate

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Nuclear Power Engineering
Molten sodium (as a coolant in fast breeder reactor)

Is not at all corrosive, even at a higher temperature
None of these
Is highly radioactive at elevated temperatures and can cause explosion, when it comes in contact with air or water
Can't attain high temperature at normal pressure

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