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After sometime, you would see that covered candle will stop burning
but uncovered candle is burning continuously. Candle covered with jar
stops burning because it does not get air.
So, it shows that air is needed for burning.
Air has force
Air has force when it blows very fast. It uproots trees, destroy poles,
etc.
Uses of Air
There are various uses of air.
F Air is used to move boats,
gliders.
F Air is used to move windmills.
F Windmill is used to grind
grains. It is also used to draw
underground water.
F Air is used by plants to make
food and for breathing.
Book-1 # 24

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