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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
How does water kept in an earthen pot (matka) become cool during summer?
What type of clothes should we wear in summer?
State three factors which affect the rate of evaporation of a liquid.
Why is heat energy needed to melt a solid ? What is this heat energy called ?
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.
What type of clothes should we wear in summer ? Why ?
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 amount of vapour in 1 cu.m. of air shows the ______.
Comment on the following statements:
Rate of evaporation of an aqueous solution decreases with increase in humidity.
The process of evaporation is not a good technic to separate salt from seawater give a reason.
