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प्रश्न
Comment on the following statements:
Rate of evaporation of an aqueous solution decreases with increase in humidity.
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उत्तर
The amount of water present in the air is known as humidity. If the water vapour in the air is already present in a large amounts, it is not able to take up more water through evaporation. Hence, the rate of evaporation of water will decrease. On a dry day, the air absorbs water more readily hence, the rate of evaporation is high on a dry day.
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संबंधित प्रश्न
Evaporation takes place from the
State three factors which affect the rate of evaporation of a liquid.
Water in a dish evaporates faster than in a bottle. Give reason.
Why is cooling produced on evaporation of a liquid?
How can the evaporation of a liquid be made faster ?
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 ?
How is humidity measured?
Give a geographical reason:
Air becomes saturated.
