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Bubbles in Your Bread

Experiment #4 from Investigating Gas Pressure

Education Level
Elementary School


All over the world, every day, people bake bread. Some people make a type of flat bread by mixing flour, salt, and water. In some places, it is common to include yeast when making bread. Have you ever baked bread using yeast? Did you know that yeast are living organisms? In a water environment, yeast use sugar and oxygen to produce a gas called carbon dioxide, CO2. The carbon dioxide makes the dough rise and creates the bubbles or air pockets that you can see in the bread.


  • Use a Pressure Sensor to measure the pressure caused by the production of CO2.
  • Make observations about how temperature affects rising dough.

Sensors and Equipment

This experiment features the following sensors and equipment. Additional equipment may be required.

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This experiment is #4 of Investigating Gas Pressure. The experiment in the book includes student instructions as well as instructor information for set up, helpful hints, and sample graphs and data.

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