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प्रश्न
Why is the air in a region dry?
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उत्तर १
The air in a region is dry primarily due to low moisture content. Moreover, distance from the sea, the high speed of the wind and increased rate of evaporation contribute to a decrease in the moisture holding capacity of the atmosphere.
For example, in Rajasthan, the air is dry and hot leading to the low moisture content in the air.
उत्तर २
We experience the dampness or dryness in the air throughout the year. The changes occurring in the weather conditions in desert areas, coastal areas and mountainous areas.
- Rajasthan lies in a region with dry and hot air. There is hardly any moisture in the air. People wear loose cotton clothes.
- Kashmir valley lies in a region with cold and dry air. Moisture is minimal in the air. People cover themselves with warm clothes.
- In Mumbai, the air is hot and humid. There, the proportion of moisture is very high in the air. In addition, if dark clouds cover the sky, the content of moisture in the air increases.
संबंधित प्रश्न
State three factors which affect the rate of evaporation of a liquid.
Wet clothes dry more quickly on a warm dry day than on a cold humid day. Explain.
Explain with an example to demonstrates that when a liquid evaporates, it takes heat from its surroundings.
Define the following terms Condensation
What type of clothes should we wear in summer ? Why ?
Why are we able to sip hot tea or milk faster from a saucer rather than from a cup ?
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.
When lemon juice is mixed with soda water, they produce brisk effervescence.
