Yeast Experiment: Fermentation #2 – Temperature

QUESTION

WHAT EFFECT DOES TEMPERATURE HAVE ON THE FERMENTATION OF YEAST?

MATERIALS

• 2 empty, clean 1-litre soda bottles
• 2 latex balloons
• 2 rubber bands
• Glass measuring cup, 1-cup capacity
• Measuring spoon: teaspoon
• Measuring spoon: tablespoon
• All-purpose flour
• Granulated sugar
• Water, room temperature
• 2 packets of Active Dry Yeast (each packet is ¼-ounces or 2¼ teaspoons)

PROCEDURE

1. Fill each soda bottle with one 1/4 ounce packet of Active Dry Yeast, 1 teaspoon sugar, 2 tablespoons all-purpose flour and 1 cup of room temperature water.
2. Set one bottle in a vessel with warm water.
3. Set the other bottle in a vessel with ice water.
4. Secure a balloon on top of each bottle with a rubber band.
5. Observe and record results. Keep both containers at a constant temperature.

OBSERVATIONS & CONCLUSION

1. What effect does temperature have on the fermentation of yeast?
2. When was the difference noticeable?