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you can do some interesting experiments using a plastic bottle and a balloon. take 1.5 liter
plastic bottle and make a small hole near its base in the cylindrical surface. take
a piece of stiff straw and press fit it inside the hole. apply some glue to seal the joint.
let the glue dry for a little while. then take a balloon and place it inside the mouth
of the bottle. stretch the mouth of the balloon and place it on the mouth of the bottle. now
you bottle is ready for experiment. if you suck air through the straw, you can inflate
the balloon. see this once again. suck the air in through the straw and the balloon inflates.
you can also inflate the balloon by blowing through the mouth if the bottle. and once
the balloon is inflated, you shut the straw. the balloon will remain inflated even though
its mouth is open. this is quiet surprising. if you blow out, the balloon will pop up and
inflate. if you suck in it will come inside the bottle and inflate. so you can play around
with the balloon and do a few experiments.