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प्रश्न
Look at Fig. 1.3 and suggest in which of the vessels A,B, C or D the rate of evaporation will be the highest? Explain.
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उत्तर
The rate of evaporation depends on the surface area of the container. The more the surface area, more is the more evaporation. It also depends on the speed of the wind. If the speed of the wind is more, more number of particles will evaporate from the surface. Hence, in figure (C) in which both these factors, surface area, and moving fan are there, the rate of evaporation will be maximum.
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संबंधित प्रश्न
State three factors which affect the rate of evaporation of a liquid.
Water in a dish evaporates faster than in a bottle. Give reason.
Explain with an example to demonstrates that when a liquid evaporates, it takes heat from its surroundings.
How does the water kept in an earthen pot (matka) become cold during summer ?
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?
Comment on the following statements:
Evaporation produces cooling.
Comment on the following statements:
Rate of evaporation of an aqueous solution decreases with increase in humidity.
Evaporation is a fast process and occurs only at the surface of the liquid.
The rate of evaporation is more when the surface area is greater.
