Ice at 0oC is more effective in cooling than water at 0oC because _______________.
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during evaporation, water absorbs extra heat in the form of latent heat of vaporization
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during evaporation, water releases extra heat in the form of latent heat of vaporization
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during melting, ice absorbs extra heat in the form of latent heat of fusion
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during melting, ice releases extra heat in the form of latent heat of fusion
Melting is the process of conversion of solid to liquid and the amount of heat energy required to convert 1 kg of solid to liquid at atmospheric pressure at its melting point is called latent heat of fusion. When ice at 0oC melts to form water at 0oC, it absorbs extra heat in the form of latent heat of fusion, i.e. water at 0oC has more heat than ice and therefore, ice at 0oC is more effective in cooling than water at 0oC. During melting, heat is absorbed and not released because heat is required to overcome the forces of attraction so as to convert solid to liquid. Therefore, option (4) is incorrect. Evaporation is the conversion of liquid to vapours at temperature below its boiling point. Hence, options (1) and (2) are incorrect.