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in this experiment we are going to make a fountain inside the bottle. for this you require
a transparent plastic bottle, a plastic dropper and scissors. with the scissors make a big
hole in the lid of the bottle and a small hole in the base of this transparent bottle.
then take an ordinary medicine dropper, if you press the bulb you can draw in water and
if you again press it you can also discharge. we do not need the bulb part. we just need
the plastic tube which has a big hole on one end and a small orifice on the other end.
now push in this plastic tube so that this orifice, the small hole is inside the water
and the large hole is outside. as you can see here. now place this transparent bottle
inside a big jar of water. if you shut and open the hole on the top, the fountain starts,
on shutting the hole fountain stops, on opening the hole the fountain starts and on shutting
the hole the fountain stops. water gushes in because there is more pressure on the black
lid of the bottle then its base. this is the reason of this fountain. once again you can
see how the fountain is formed. on opening the hole the water gushes in, on closing the
hole water stops flowing. this is a very simple experiment. all you require is a small transparent
bottle and a dropper and it will bring you loads of fun.