DRY ICE or ICE: Solid carbon dioxide and solid water are refrigerants used to postpone spoilage of foods. If cost and availability are not considerations, choice of the better refrigerant becomes a thermodynamic consideration. Which is better, To narrow make the answers easier to understand, set the volume of refrigerant rest

CoolantProcess/Temp
at 1 atm
Ratio
cooling / mass
Ratio
cooling / volume
ice
solid water
solid melts @ 0o
to liquid @0o
  
dry ice
solid carbon dioxide
sublimes @ 0o