Nuclear Power Engineering
The specific heats of three gaseous coolants namely H₂, He and CO₂ in the increasing order are

CO₂, He, H₂
H₂, CO₂, He
H₂, He, CO₂
CO₂, H₂, He

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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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