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

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
Is a better neutron moderator as well
All of these

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Nuclear Power Engineering
An ideal coolant for a nuclear reactor should

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

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