Question

why is ice at 273 more effective in cooling than water at the same temperature ​

Answer 1

Ice at 273 K would absorb latent heat as well as the heat energy in order to attain the room temperature. Water at 273 K would just absorb heat energy in order to attain the room temperature. Thus, the water at 273 K would absorb less amount of heat energy from the surroundings as compared to ice at 273 K. Therefore, ice at 273 K is more effective in cooling then water at the same temperature.

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Answer 2

Because at 0° C (273 K) particles of water have more energy comparing it to water at the same temperature.