Why does an inflated balloon shoot off when its air is released?    

Expert Answers

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When a balloon is inflated we increase the pressure inside the balloon so that the pressure inside the balloon is greater than the pressure outside the balloon (I.e. the air pressure). When we open the balloon, the air is released so the air inside the balloon is at the same pressure as the air outside the balloon. When this happens, the air escaping from the balloon results in a force in the opposite direction sending the actual balloon in the opposite direction. The escaping air in one direction provides the force in the opposite direction for the balloon to go in the opposite direction.
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