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प्रश्न
Explain with an example to demonstrates that when a liquid evaporates, it takes heat from its surroundings.
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उत्तर
If some spirit is poured on cotton wrapped around the bulb of a thermometer, the reading of the thermometer falls. This shows that cooling is produced when a liquid evaporates taking heat from surroundings.
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संबंधित प्रश्न
Why does a desert cooler cool better on a hot dry day?
Give two applications of evaporation.
A patient suffering from high fever is advised to put wet clot strips on his forehead. Why?
How does the water kept in an earthen pot (matka) become cold during summer ?
What type of clothes should we wear in summer ? Why ?
Why are we able to sip hot tea or milk faster from a saucer rather than from a cup ?
Why does our palm feel cold when we put some acetone (or perfume) on it ?
The amount of vapour in 1 cu.m. of air shows the ______.
Comment on the following statements:
Rate of evaporation of an aqueous solution decreases with increase in humidity.
Evaporation is a fast process and occurs only at the surface of the liquid.
