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

Is a better neutron moderator as well
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
All of these

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Nuclear Power Engineering
A homogeneous reactor is the one, in which the

Fissile atoms are evenly distributed throughout the mass of nuclear reactor
Same substance (e.g. heavy water) is used as moderator & coolant
The fuel and the moderator is mixed to form a homogeneous material
All of these

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