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प्रश्न
Why does our palm feel cold when we put some acetone or petrol or perfume on it?
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उत्तर
- When we put some acetone or petrol or perfume on our palm, it evaporates.
- During evaporation, particles of the liquid absorb energy from the surrounding or the surface of the palm to compensate for the loss of energy, making the surroundings cool.
- Hence, our palm feels cold when we put some acetone or petrol or perfume on it.
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संबंधित प्रश्न
State three factors which affect the rate of evaporation of a liquid.
Why is cooling produced on evaporation of a liquid?
Why is heat energy needed to melt a solid ? What is this heat energy called ?
Define the following term Freezing.
If the back of your hand is moistened with alcohol, you will find that it rapidly becomes dry. Why is it that while it is drying, your hand feels cool ?
How does the water kept in an earthen pot (matka) become cold during summer ?
Why does our palm feel cold when we put some acetone (or perfume) on it ?
During summer days, water kept in an earthen pot (pitcher) becomes cool because of the phenomenon of :
Comment on the following statements:
Evaporation produces cooling.
The process of evaporation is not a good technic to separate salt from seawater give a reason.
