Nuclear Power Engineering
An ideal coolant for a nuclear reactor should

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

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Nuclear Power Engineering
Commercial power generation from fusion reactor is not yet possible, because

It is difficult to initiate fusion reaction
The fuel required (e.g. deuterium and tritium) is scarce
It is difficult to control fusion reaction
Quantity of fuel required for initiating fusion reaction is prohibitively high

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