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प्रश्न
State the various conditions that favour the process of evaporation.
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उत्तर
The various conditions that favour the process of evaporation are discussed as under :
- Concentration of water vapour in air: (humidity level) : If the water vapour concentration is high in air the evaporation process gets slowed down.
- Pressure : Evaporation takes place faster when pressure is less and vice versa.
- Surface Area: If the surface area is large then evaporation takes place faster.
- Temperature : On increasing the temperature, the rate of evaporation increases.
- Rate offlow of air : If air is moving over the place all the time, then the concentration of water vapour decreases in the surroundings, thus increasing evaporation rate.
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संबंधित प्रश्न
Match the columns
| column A | coulmn B |
| 1. A change which cannot be easily reversed | a. man-made change |
| 2.A change that repeats itself at regular intervals | b. chemical change |
| 3. A change that is made by humans | c. physical change |
|
4. A change in which the original substance cannot be obtained |
d. periodic change |
| 5. A change where no new substance is formade | e. irreversible change |
| f. slow change |
State the differences between a physical change and a chemical change.
Make a list of different types of changes with example.
Which of the following are physical changes and which are chemical changes ?
Glowing of an electric bulb
Classify the Following as a Physical Or a Chemical Change.
Making of a Sugar Solution
State whether the following statement is true or false. If false write the correct statement.
Melting of butter and wax are examples of chemical changes.
Analogy:
Melting of ice: Physical change.
Popping of popcorn: ______.
If you leave a piece of iron in the open for a few days, it acquires a film of brownish substance, called rust.
Do you think rust is different from iron?
Adding sugar to milk is a physical change.
Mention some of the different conditions needed for chemical changes to occur.
