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प्रश्न
Name two ways of change of liquid state to the vapour state and distinguish them.
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उत्तर
Two ways of change of liquid state to vapour state are:
- Evaporation
- Boiling.
DIFFERENCE BETWEEN EVAPORATION AND BOILING:
| BOILING | EVAPORATION |
|
(1) Heat is supplied. |
Heat is absorbed. |
| (2) Fast process. | Slow process. |
| (3) Starts from the bottom. | Starts form surface i.e. |
| (4) Sound is produced. | surface phenomenon Silent process. |
| (5) Heating effect | Cooling effect |
| (6) Takes place at a fixed temperature called the boiling point. | Takes place at all temperatures. |
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संबंधित प्रश्न
Evaporation takes place only from the surface of liquid.
All molecules of a liquid take part in the process of evaporation.
The molecules of liquid ............. heat from surroundings in evaporation.
During boiling or vaporization
The boiling point of a liquid is increased by
Do all the molecules of a liquid take part in evaporation? If not, explain your answer.
No heat is supplied to a liquid during evaporation. How does then the liquid change into its vapours?
Give reason for the increase in rate of evaporation of a liquid when air is blown above the liquid.
Give reason for the increase in rate of evaporation of a liquid when surface area of liquid is increased.
How is the heat energy supplied to a liquid used during boiling at a fixed temperature?
