High latent heat of vaporization
High boiling point
Low specific heat of liquid
Higher critical temperature
Higher coefficient of performance
Low temperature at high altitudes
High heat transfer rate
Low weight of system per kg of refrigerant
Low pressure liquid and vapour refrigerant
Low pressure vapour refrigerant
High pressure liquid refrigerant
None of these
These react with water vapour and cause acid rain
These react with oxygen and cause its depletion
These react with plants and cause greenhouse effect
These react with ozone layer
T1/(T2-T1)
T2/(T2-T1)
(T1-T2)/T1
(T2-T1)/T1