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प्रश्न
Why does our palm feel cold when we put some acetone (or perfume) on it ?
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उत्तर
Our palm feels cool when we put acetone over it because acetone takes up the latent heat of vaporisation to change into vapour from our palm.
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संबंधित प्रश्न
How does water kept in an earthen pot (matka) become cool during summer?
A liquid can change into vapour state at all temperatures.
What is evaporation?
Why is heat energy needed to melt a solid ? What is this heat energy called ?
How does the water kept in an earthen pot (matka) become cold during summer ?
How will you demonstrate that water vapour is present in air ?
The amount of vapour in 1 cu.m. of air shows the ______.
Comment on the following statements:
Evaporation produces cooling.
The rate of evaporation is more when the surface area is greater.
When lemon juice is mixed with soda water, they produce brisk effervescence.
