November 17, 2013

Unpopable Balloon



  1. For this trick you’ll need a balloon, candle and some water.
  2. First put a small bit of water into the balloon, blow it up and knot it.
  3. Then carefully lower it over a candle.
  4. It shouldn’t pop.

This is because for something to rip or break there needs to be some weakness in the material.

Things break because enough energy is added to the material to rip apart the bonds between molecules or to make a small defect get bigger.

When a balloon filled with air is held over a flame, the balloon melts a little bit. This means there is now a weak point in the balloon.

The air inside the balloon pushes really hard on the melted part and makes the weakness get bigger, so the balloon pops.

When the balloon is filled with water, the water absorbs the heat. This stops the balloon from melting. Because there is no weak point, the balloon doesn’t pop.

 

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