Why is ice at 273 K more effective in cooling than water at the same temperature ?

Ans. Cooling takes place when heat is removed from a system. In case of ice at 0°C (273 K), it will take heat (latent heat) from the medium to convert itself first into water at 0°C (273 K) and then into water at a higher temperature. In short, in case of ice at 0°C (273 K), there will be a change in phase, whereas in case of water at 0°C (273 K), there will be no change in phase. Hence, lesser energy will be taken from the medium.

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