why ice bag is coolant than water?

Question

why is an ice bag at zero degree Celsius more effective coolant than equal amount of water at zero degree Celsius?

Answer 1

It's because of the latent heat of melting. Ice must absorb a great deal of heat from the environment in order to break the ice crystal bonds and become liquid, even if it doesn't appreciably change in temperature in the process. It takes about as much heat to melt a liter of ice as is take to raise its temperature to the boiling point.

Answer 2

Because ice is below zero degrees but water is not!

Answer 3

they are both frozen water , so i cannot see the difference