Take a transparent glass tube or a
plastic pipe. The length of the pipe/
the tube should be about 25 cm and its
diameter should be 5-7.5 cm. Also,
take a piece of a thin sheet of good
quality rubber, say, a rubber
balloon. Stretch the rubber sheet
tightly over one end of the pipe.
Hold the pipe at the middle, keeping
it in a vertical position (Fig.11.14).
Ask one of your friends to pour some
water into the pipe. Does the rubber
sheet bulge out? Note also the
height of the water column in the
pipe. Pour some more water.
Observe again the bulge in the
rubber sheet and the height of the
the water column in the pipe. Repeat
this process a few more times. Can
you see any relation between the
amount of the bulge in the rubber
sheet and the height of the water
a column in the pipe?
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