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

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

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Nuclear Power Engineering
A boiling water reactor is the one, in which the

Fuel and the coolant are thoroughly mixed to form a homogeneous solution
Pressurised water is pumped into the core
Coolant water is allowed to boil in the core of the reactor
Coolant water, after being heated in the reactor core, generates steam in a boiler

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