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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
Why are we able to sip hot tea or milk faster from a saucer than a cup?
Would you cool a bucket of water more quickly by placing it on ice or by placing ice in it? Give reasons for your answer.
Define the following term Freezing.
If the back of your hand is moistened with alcohol, you will find that it rapidly becomes dry. Why is it that while it is drying, your hand feels cool ?
How does the water kept in an earthen pot (matka) become cold during summer ?
What type of clothes should we wear in summer ? Why ?
During summer days, water kept in an earthen pot (pitcher) becomes cool because of the phenomenon of :
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 ?
The rate of evaporation ______ with rising temperature.
