Nuclear Power Engineering
Use of molten metal as a coolant in fast breeder reactor helps in

Rapid heat transfer from the core
Breeding neutrons
Accelerating the neutrons
Accelerating the reaction rate in the core

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

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