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प्रश्न
Wet clothes dry more quickly on a warm dry day than on a cold humid day. Explain.
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उत्तर
Rate of evaporation is directly proportional to temperature. Thus, the rate of evaporation is higher on a warm day i.e. hot day than cold day having low temperature and clothes dry soon on a warm day.
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संबंधित प्रश्न
Why are we able to sip hot tea or milk faster from a saucer rather than from a cup ?
How will you demonstrate that water vapour is present in air ?
How can the evaporation of a liquid be made faster ?
What is evaporation ? State the various factors which affect evaporation.
Why does evaporation cool a liquid ?
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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 ?
Comment on the following statements:
Evaporation produces cooling.
The rate of evaporation ______ with rising temperature.
The process of evaporation is not a good technic to separate salt from seawater give a reason.
