Question

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

Answer 1

There is something called Latent Heat. Water at 273k has more latent heat of energy as compared to ice at 273k, since ice can easily absorb energy from surrounding in the from of latent heat to form water whereas water has no such privilege hence ice is more effective in cooling than water at same temperature.

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Answer 2

Answer:

At 273K ice can easily absorb more heat energy from the surrounding in the form of latent heat and overcome the fusion to become water.

Water does not absorb this extra heat from the medium.

Thus the cooling effect of ice is more than water at the same temperature.

Cooling takes place when heat is removed from a system. In case of ice at 0oC, it will first take heat (latent heat) from the medium to convert itself into water at 0oC and then into water at higher temperature. In short, in case of ice at 0oC, there will be change in phase so more energy will be required, whereas in case of water at 0oC, there will be no change in phase. Hence, lesser energy will be taken from the surroundings. So, at same temperature of 273 K, large amount of heat will be removed by ice from the surroundings than in case of water. Hence, ice at 273 K is more effective in cooling than water at the same temperature.