Write four physical properties of air.
Important Questions on Air Around Us
Answer these questions on the components of air.
(i) Label the pie chart, which shows the composition of air.
(ii) Which component of air is essential for respiration?
(iii) Which component of air is essential for a fire to burn?
(iv) List three components of air that are found in very small amounts.
(a) _____
(b) _____
(c)_____.
Study the picture and answer the questions.
(i) Will the flame of the candle go out at once? Why or why not?
(ii) Will the water start boiling after some time? Why or why not?
(iii) Will the candle flame go out after some time? Why or why not?
(iv) If you hold the inverted glass jar so that it covers the candle flame but its rim is above the water level, what will happen?
Describe how you will show the following:
There is water vapour in the air.
Describe how you will show the following.
- There is dust in the air.
Describe how you will show the following.
There is air in water.
Describe how you will show the following:
There is air in the soil.
Answer these question on earthworm.
How do earthworms help air enter the soil?
