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प्रश्न
Why does evaporation cool a liquid ?
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उत्तर
Evaporation cools the surroundings and the rest of the liquid because when a liquid evaporates, it takes up the latent heat of vaporisation from the surroundings and the rest of the liquid present below the surface with which, it is in contact.
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संबंधित प्रश्न
How does water kept in an earthen pot (matka) become cool during summer?
Why are we able to sip hot tea or milk faster from a saucer than a cup?
Explain with an example to demonstrates that when a liquid evaporates, it takes heat from its surroundings.
Define the following terms Condensation
What is evaporation ? State the various factors which affect evaporation.
Which of the following are also considered to be the states of matter ?
- Plasma
- Platelets
- BEC
- BHC
During summer days, water kept in an earthen pot (pitcher) becomes cool because of the phenomenon of :
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 ?
Can you suggest a method to collect water from sea water?
The process of evaporation is not a good technic to separate salt from seawater give a reason.
