Heat capacity cryogenic fluids

Gaseous helium is commonly used as the working fluid ia closed-cycle cryogenic refrigerators because of chemical iaertness, nearly ideal behavior at all but the lowest temperatures, high heat capacity per unit mass, low viscosity, and high thermal conductivity. 

Aside from differences in heat capacity and boiling points, the cryogenic fluids showed no great apparent differences from water during boiling heat transfer. 

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