​Learning Objectives

• ​Discuss what is air

• ​Identify composition of the air

• ​Discuss the importance of air.

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​What is air?

​What is AIR?

​-Air is a mixture of many gases.

• Air is present around us.

• We can't see air, but we can feel it when it moves.​

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​What is a moving air called?

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​What is a moving air called?

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​A moving air is called wind.

​Atmosphere

​The earth is surrounded by a thick layer of air called the atmosphere.

What are the components of air?

What are the components of air?

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​-Air is a mixture of gases such as;

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All living things need oxygen to live. Carbon dioxide is used by plants to prepare food.

​Air also contains water vapour.

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​DUST IN THE AIR

​Touch an object at home or in school that has not been wiped for many days. You will find a layer of dust on it. Where does the dust come from?

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​ It comes from the air.

​Why we need Air?

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​All living beings need air to survive.

Human beings and animals

​-Human beings and animals need oxygen for breathing. They cannot survive without air as well as plants do to convert food to energy.

​While climbing on the mountains,

​**mountaineers always carry oxygen cylinders for breathing. This is because air becomes thinner as they climb up.