Air around us.

Air around us is a easy and an enjoyable chapter


-Kanika Rawal ​

Air around us

Is air present everywhere around us?

​ Activity one.

Have you seen an empty bottle? Is it really empty, or does it have something inside? Turn it upside down. Is something inside it now. Now dip it inside a Bucket full of water. not tilt the bottle slightly. Does the water now enter the bottle?

Is air present everywhere around us?

​ Activity one.

Do you see bubbles coming out of the bottle, or hear any bubble sound? Can you now guess what was in the bottle? Yes. you are right. It is air. The space was occupied. was occupied by air. automatic. That is why you notice. that water

Is air present everywhere around us?

​ Activity one.

Does not enter the bottle when it is pushed in an inverted position as they. was number space for air to escape when the water was tilted, the air was able to come out. In the form of bubbles and water filled up the empty space that the air has occupied. This activity shows that Air. occupies space.

Poll

The space inside the bottle was occupied by.?

• Nitrogen.

• Dust.

• Smoke.

• Air.

Atmosphere

A Earth is surrounded by a thin layer of fear. This layer extends up too many kilometres above the surface of the earth and is called atmosphere. As we move higher in that atmosphere, the air gets rarer. Now, can you think mountaineers carry oxygen cylinders with them while climbing high mountains? This is because air becomes. lesser in higher altitudes.

What is air made up of?

Until the 18th century, people thought that air was just one substance. Experiments have proved that it is really not so. Here is a mixture of many gases. What kind of mixture is it? Let us find out about some of the major components of this mixture, one by 1.

​ its presence is important for water cycle in nature.

Water vapour.

Oxygen is needed for breathing this gas. Also plays a major role in Combustion. Oxygen is about 21 per cent present in air.

Oxygen.

Poll

What would happen if carbon dioxide vanished from the atmosphere forever?

• We would live forever.

• We would sleep forever.

• The life would be impossible.

• The life would be possible.

Open Ended

What did you understand from the concept? What a vapour? When it is formed

Open Ended

Tell us about perceived motion.?