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well, you can understand how a rocket works with the help of a balloon. take 8cms long
straw and weave a five meter long thread in it. remove the thread and tie its free end
to the branch of a tree. now take he straw towards the free end which should be around
5m away. now inflate the balloon and tape the balloon to the straw. with one hand hold
the balloon and with the other pull the thread tight. when you release the balloon, it shoots
forward just like a rocket. air ejects from the mouth of the balloon and this gives a
push to the balloon in forward direction. this is how the rocket works. this is the
principle of action and reaction.