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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?
Why does our palm feel cold when we put some acetone or petrol or perfume on it?
Why are we able to sip hot tea or milk faster from a saucer than a cup?
What type of clothes should we wear in summer?
What produces more severe burns, boiling water or steam?
Why are volatile liquids such as alcohol and spirit stored in tightly closed bottles?
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 ?
Why is the air in a region dry?
Comment on the following statements:
Evaporation produces cooling.
The rate of evaporation is more when the surface area is greater.
