Advertisements
Advertisements
प्रश्न
Comment on the following statements:
Rate of evaporation of an aqueous solution decreases with increase in humidity.
Advertisements
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.
APPEARS IN
संबंधित प्रश्न
How does water kept in an earthen pot (matka) become cool during summer?
What type of clothes should we wear in summer?
Wet clothes dry more quickly on a warm dry day than on a cold humid day. Explain.
Water in a dish evaporates faster than in a bottle. Give reason.
Why is cooling produced on evaporation of a liquid?
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 ?
The amount of vapour in 1 cu.m. of air shows the ______.
Give a geographical reason:
Air becomes saturated.
Can you suggest a method to collect water from sea water?
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.

