Science project

A Thunderous Sound


  • Balloon


  1. Blow up a balloon so that it is near the breaking point. You are compressing the air inside the balloon.
  2. Set the balloon on the ground.
  3. Put your foot on the balloon and slowly push down. Your foot will feel a jolt as the air expands outward from the broken balloon. Although the rapid expansion of air coming from the balloon is very slight compared to the expansion caused by a lightning bolt, the principal is the same. Both cause a very loud explosive sounding noise.
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