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प्रश्न
State three differences between evaporation and boiling
उत्तर
| BOILING | EVAPORATION | |
|---|---|---|
| Definition of these two terms | Boiling is vaporisation of liquid into gas due to continuous heating. Most of the time it is not a natural process. | Evaporation on the other hand is a natural process and it is similar to boiling , but the liquid form changes into gaseous form when there is a increase in either temperature or pressure or both. |
| Occurrance | Large mass | only on surface |
| Amount temperature involved | Boiling happens when the temperature reaches to the boiling point. | In Evaporation the temperature does not need to reach to boiling point |
| Bubble Formation | Bubble formation is visible | Bubbles do not form in evaporation |
| Energy | Usually external source of energy is needed for boiling to happen. | Most of the time energy for evaporation is supplied by the atmosphere or surrounding. |
| Length of the process | Rapid Process | Slow process compared to boiling |
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संबंधित प्रश्न
State whether the following is physical or chemical changes.
growing of a piglet into a pig —
State whether the following is physical or chemical changes.
(energy produced) dissolving sugar in water —
Tick (√) the correct alternative from the choice given for the following statement
Which one of the following is volatile in nature ?
True or false
Dissolving of a solid in liquid is a physical change.
Tick the most appropriate answer.
Photosynthesis requires
Name two reversible changes.
Classify the Following as a Physical Or a Chemical Change.
Making of a Sugar Solution
Given reason:
Burning of paper is a chemical change.
Read the paragraph and note down the various types of changes it mentions.
It was nearing six o'clock in the evening. The sun was setting. A breeze was blowing. Leaves on the tree were shaking. Sahil was sitting in the courtyard, rolling balls of wet soil, and shaping them into various toys. Then he felt hungry and went into the house. Mother made a dough from wheat flour and fried purees. While eating hot purees, his attention was drawn outside the window. It had started raining. There was lightning, too. Sahil was enjoying his dinner in the dim light.
Match the examples of changes in List I with the correct type of change in List II.
| List I | List II |
| 1. Burning of paper | A: Physical change |
| 2. The ringing of an electric bell | B: Chemical change |
| 3. Curdling of milk | |
| 4. Electric light is switched on | |
| 5. Melting of butter |
