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प्रश्न
Would you cool a bucket of water more quickly by placing it on ice or by placing ice in it? Give reasons for your answer.
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उत्तर
We can cool a bucket of water quicker when we keep ice inside the bucket because ice cubes absorb more and more heat from the liquid system in which it is present, cooling the liquid system quickly. But when we put water in ice, the ice comes in contact with the bucket and absorbs the latent heat from both the water and bucket. Therefore, the effectiveness of cooling is reduced.
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संबंधित प्रश्न
How does water kept in an earthen pot (matka) become cool during summer?
Why does our palm feel cold when we put some acetone or petrol or perfume on it?
Why are we able to sip hot tea or milk faster from a saucer than a cup?
Give two applications of evaporation.
Explain why in hot summer days water remains cool in earthen pots.
How will you demonstrate that water vapour is present in air ?
During summer days, water kept in an earthen pot (pitcher) becomes cool because of the phenomenon of :
Give a geographical reason:
Air becomes saturated.
The rate of evaporation ______ with rising temperature.
The rate of evaporation is more when the surface area is greater.
