Nuclear Power Engineering
A fertile material is the one, which can be

Fissioned by fast neutrons
Fissioned by slow (thermal) neutrons
Converted into fissile material on absorption of neutron
Fissioned by either slow or fast neutrons

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

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

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