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Pressure in Fluids

The amount of force acting on a given area. Pressure = Force/Area

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Pop Rock Explosion

Pop Rock Explosion

License: CC BY-NC 3.0

Yum! Rock candy. Actually, it’s pop rock candy. It pops and fizzes as it melts in your mouth. Do you know why?

The Back Story

  • The reason pop rocks pop is that they release gas as they melt. The gas is under pressure in tiny bubbles inside the candy.
  • The gas is carbon dioxide, the same gas that fizzes out of soda (pop) when you open the can.
  • How much pressure is the gas under in pop rocks or soda? There’s a widespread myth that if someone swallowed enough pop rocks and soda, the pressure of all that gas could cause the stomach to explode.
  • The Mythbusters TV show investigated this myth, as you can see in this video: http://www.youtube.com/watch?v=93vjY9RY4-k

Can You Apply It?

At the link below, learn more about pop rocks. Then answer the following questions.

  1. How are pop rocks made? How does high-pressure gas get inside the candy?
  2. Gas always moves from an area of higher pressure to an area of lower pressure. How does this apply to the gas in pop rocks?
  3. Describe the experiment the Mythbusters did to answer the question: Can pop rocks and soda cause the stomach to explode? What was the result of the experiment?
  4. How does gas pressure explain what you observed in the Mythbusters’ experiment?


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