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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
A liquid can change into vapour state at all temperatures.
What is evaporation?
State three factors which affect the rate of evaporation of a liquid.
Why does all the water of the earth not get evaporated during hot summer days ?
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 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 :
Evaporation of water from lakes and river ______.
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.
