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प्रश्न
Water in lakes and ponds do not freeze at once in cold countries. Give a reason is support of your answer.
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उत्तर
The specific latent heat of fusion of ice is sufficiently high (= 336 J g-1), and so to freeze water, a large quantity of heat has to be withdrawn. Hence, it freezes slowly and thus keeps the surroundings moderate.
संबंधित प्रश्न
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