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प्रश्न
A patient suffering from high fever is advised to put wet clot strips on his forehead. Why?
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उत्तर
Water in wet strips evaporates taking latent heat required for evaporation from the forehead. The temperature of the forehead (body of the patient) falls and he feels relieved.
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संबंधित प्रश्न
What produces more severe burns, boiling water or steam?
State three factors which affect the rate of evaporation of a liquid.
Explain with an example to demonstrates that when a liquid evaporates, it takes heat from its surroundings.
Explain why in hot summer days water remains cool in earthen pots.
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.
Which produces more severe burns : boiling water or steam ? Why ?
How does the water kept in an earthen pot (matka) become cold during summer ?
Why is the air in a region dry?
Comment on the following statements:
Rate of evaporation of an aqueous solution decreases with increase in humidity.
The process of evaporation is not a good technic to separate salt from seawater give a reason.
