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प्रश्न
A liquid can change into vapour state at all temperatures.
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उत्तर
is Evaporation.
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संबंधित प्रश्न
What is evaporation?
Why are volatile liquids such as alcohol and spirit stored in tightly closed bottles?
Explain with an example to demonstrates that when a liquid evaporates, it takes heat from its surroundings.
Explain why in hot summer days water remains cool in earthen pots.
Why does all the water of the earth not get evaporated during hot summer days ?
How will you demonstrate that water vapour is present in air ?
The evaporation of water increases under the following conditions :
The scientists now say that there are actually five states of matter A, B, C, D and E. The state A has a fixed volume but no fixed shape. The state B can be compressed very easily by applying pressure and state C has a fixed shape as well as a fixed volume. The state D is a mixture of free electrons and ions whereas state E is named after an Indian scientist and a famous physicist.
- Name the physical states (i) A (ii) B (iii) C (iv) D, and (v) E
- Name one substance belonging to state C which can directly change into vapours on heating. What is this process known as ?
- Name one substance which normally belongs to state B but whose solid form changes directly into gaseous state.
- Name the most common substance belonging to state A.
- Which state of matter makes the sun and other stars to glow ?
Give a geographical reason:
Air becomes saturated.
Comment on the following statements:
Rate of evaporation of an aqueous solution decreases with increase in humidity.
