Chapter 1: Matter in our Surroundings

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Matter in our Surroundings


Q.7: Why is ice at 273 K more effective in cooling than water at the same temperature?


The amount of heat energy that is required to change 1 kg of a solid into liquid at atmospheric pressure at its melting point is known as the latent heat of fusion. Ice has a large latent heat of fusion. So, when the ice melts to achieve room temperature, the ice cubes absorb large amounts of heat from the surroundings which are equal to its latent heat of fusion. Water on the other hand just absorbs the thermal energy to achieve room temperature.

That is why ice at 273K is more effective in cooling than water at 273K.

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