UNIT 2: AIR
Some things are not alive but still they need air to function. For example, air is needed to
burn things. Even engines of vehicles need air to burn their fuel.
Figure 9 - Air is needed by non-living things
When we switch on the stove, the gas burns in the presence of air and we are able to
cook our food.
(i) From where does the gas receive its supply of air to burn?
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A vehicle moves because its fuel burns in its engine in the presence of air.
(ii) From where does the engine of the vehicle obtain air to burn its fuel?
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Therefore, air is necessary for burning.
Activity STUDYING THE NEED FOR AIR
BY NON-LIVING THINGS
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