PDF chapter test TRY NOW
Air is everywhere:
Let us take an empty glass bottle. Is it really empty or does it have something inside? Now, shall we turn the glass bottle upside down? Can you agree that there is still something inside the empty glass bottle?
Let us do the following activity to find what is there inside an empty glass bottle.
Experimental set-up
Dip the open mouth of the bottle into the trough filled with water as shown in the above figure.
Observe the bottle. Does water enter the bottle?
Observe the bottle. Does water enter the bottle?
Now tilt the bottle slightly. Now again dip the open mouth of the bottle as shown in figure. Do you think that water will enter the bottle?
Kindly observe the figure carefully. You can see bubbles coming out of the bottle.
When you perform the experiment, can you hear the bubbly sound? Can you now guess what was inside the bottle?
was present in the bottle.
The bottle was at all. In fact, it was filled even when you turned it upside down.
That is why the does not enter the bottle when it is pushed in an position, as there was to escape.
When the bottle was tilted, the air was able to come out in the form of , and filled up the empty space that the has occupied.
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