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प्रश्न
Why is cooling produced when a liquid evaporates?
उत्तर
For changing liquid into vapours heat is needed this heat is taken from the container or surroundings and temperature of container or body itself fall and cooling is produced.
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संबंधित प्रश्न
Evaporation is rapid on a wet day.
All molecules of a liquid take part in the process of evaporation.
All molecules of a liquid take part in boiling.
Boiling is a rapid phenomenon.
Boiling occurs at ....................
The molecules of liquid ............. heat from surroundings in evaporation.
Match the column
| Column A | Column B |
| (a) Blowing air increases | (1) Increase in intermolecular separation |
| (b) Increase in pressure increases | (2) Pendulum of a clock |
| (c) Thermal expansion |
(3) Cooking utensils |
| (d) Invar | (4) Boiling point |
| (e) Pyrex glass | (5) Evaporation |
No heat is supplied to a liquid during evaporation. How does then the liquid change into its vapours?
Give reason for the increase in the rate of evaporation of a liquid when temperature of liquid is increased.
Name two ways of change of liquid state to the vapour state and distinguish them.
