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this simple experiment demonstrates the production of suction because of creation of vacuum.
you require 3 half liter bottles and two short tubes of plastic. now make holes in plastic
bottles, in one lid, in two bottles near the base and in one bottle right in the base.
these are the 3 bottles with the holes. middle bottle has a lid with a hole. with the two
short flexi tubes, connect the left and the middle bottle near the base and also the lid
of the middle bottle and base of the right hand bottle with a flexi tube. now these are
the joints with leakages so apply some rubber adhesive to seal the joints so that there
is no leakage of air. then wait for a while for this glue to dry up. now the apparatus
is all ready. left middle and right bottle.. now pour colored water in left bottle. and
it will be transferred through the tube to the middle bottle and soon the level of water
in both the bottles will be same. now light a candle and lift the right bottle and hold
it tightly over the lighted candle. soon all the oxygen will be exhausted and, there will
be vacuum in the right bottle and so it will suck up air from the middle bottle and so
the level of water will rise in middle bottle. once you remove the right hand bottle, well,
the level in the left and middle bottle will again became same.