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Question

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


Solution

Cooling takes place when heat is removed. In the case of ice at $$273 K$$ ($$0^0C$$), it will first take the heat (the latent heat of melting) to convert itself into the water at $$273 K$$  Whereas, water at $$273 K$$ will absorb heat lesser than the latent heat of melting of ice and also its phase won't change until the temperature reaches $$373K$$ ($$100^0C$$).
So, at the same temperature of $$273 K$$, a large amount of heat will be removed by ice from the surroundings than in the case of water. Hence, ice at $$273 K$$ is more effective in cooling than water at the same temperature. 

Science
NCERT
Standard IX

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