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Question
Identify the substance that is more effective in cooling.
Options:
A .  Water at 80∘C
B .  Water at 100∘C
C .  Ice at 0∘C
D .  Steam at 100∘C
Answer: Option C
:
C
Ice at0Ccan be more effective in coolingbecause of the phenomenon called latent heat of fusion. Latent heat of fusion of ice is theheat absorbed by ice to change its state to water at 0C. So, ice at0C can extract more heat from another substance and give better cooling.

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