Science Fair Projects World

The Effect of Temperature on Yeast Fermentation




Analyze how varying temperatures influence the rate of yeast fermentation.


  • Yeast
  • Sugar
  • Warm water
  • Balloons
  • Bottles
  • Thermometer
  • Warm bath
  • Notebook for observations


  1. Mix yeast, sugar, and warm water in each bottle.
  2. Stretch a balloon over the opening of each bottle to capture the gas produced.
  3. Place each bottle in a different temperature setting (e.g., room temperature, warm bath, refrigerator).
  4. Measure the temperature of each environment using a thermometer.
  5. Observe the balloon over several hours to see how much it expands.
  6. Record the size of the balloon at regular intervals in a notebook.
  7. Compare the rate of fermentation by measuring the amount of carbon dioxide produced at each temperature.
  8. Draw conclusions about the optimal temperature for yeast fermentation.