Nuclear Power Engineering
The critical mass of a fissionable material can be reduced by

Cooling it
Surrounding it by neutron absorbing material
Heating it
Surrounding it by neutron reflecting material

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

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

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