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this fountain is essentially the very famous the helen's fountain. you require 3 plastic
bottles, some flexi tube, some stiff straws. now apply glue on two lids and stick them
back to back. then with the help of scissors make a small hole in both the lids. take a
long stiff straw and press fit it in this hole. there should be no leakage of water
or air from this joint. now screw on two bottles on the two lids so that the long end of the
straw is on the top bottle and short on the bottom bottle. now cut the third bottle into
half. apply glue on the base of the top bottle, wait for a while for the glue to dry up and
then stick the bottom half bottle on it. make four holes with the help of scissors to attach
the bottles with flexi tube. this is the middle and top half bottle being attached. now attach
the top half bottle with the bottom bottle with flexi tube. now apply fevibond on all
the joints. it is a kind of rubber adhesive which seals the joints. no water will leak
out from these joints. wait for a while for the glue to dry. now this is the entire assembly
in a perspective. this is the whole assembly, two flexi tube outside. now add colored water
to the cut bottle and through the right side tube it will go to the base bottle. once the
bottom bottle is filled with colored water, upturn the apparatus. now the water from top
bottle will automatically gravitate to the middle bottle. this is kind of preparation
for the experiment to start. once the middle bottle is full, upturn the apparatus and now
the real experiment starts. now if you add some water to the cut bottle, it will go to
the bottom bottle, air will be expelled from there, come to the middle bottle and water
from here will come out from the top bottle like a fountain and this fountain will keep
continuing for a considerable length of time. this is a very simple and amazing experiment.
until the middle bottle drains out, the fountain will continue to work. see this once again.
add some more water to cut bottle, water will come to the bottom bottle, air will be expelled
to the middle bottle, from here the water will come out as a fountain in the cut bottle
and this will continue until the middle bottle is drained out. you can see children enjoy
this very beautiful helen,s fountain. you can also put the flexi tube inside the bottles
and here is the small orifice from where the fountain is coming out.