What explains the result?
Yeast metabolism releases carbon dioxide more quickly in a suitable warm range; too much heat harms yeast.
LIFE SCIENCE · GRADES 4–8
Yeast balloon gas lab
INVESTIGATION QUESTIONHow does water temperature change yeast gas production?
● ILLUSTRATIVE SCIENCE MODEL
ENGLISH CAPTIONS
Set equal fermentation bottles. Only temperature changes, so later balloon differences can be compared with that factor.
0.0 / 3.0 s
Where does this matter?
Fermentation makes bread rise and is used to produce foods and fuels.
What should you keep in mind?
Sugar amount, yeast freshness, seal quality, and temperature must be controlled in a real trial.
DEDICATED YEAST METABOLISM LAB · GRADES 6–9
Yeast makes
gas
Compare cold, warm and very warm water while keeping yeast, sugar and bottle setup the same. Follow a short model, then measure the real balloons after 20 minutes.
BALLOON GAS-COLLECTION RIGT+0 MIN
Cold · 10°CTRIAL 1
YEAST + SUGAR
Warm · 38°CTRIAL 2
YEAST + SUGAR
Very hot · 66°C · adultTRIAL 3
YEAST + SUGAR
0 MIN
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GAS COLLECTION LOG
Balloon circumference after 20 minutes
No result appears until the model timer ends. Real balloon circumference is only a proxy for gas; the model values are not classroom measurements.
WHAT THE YEAST DOES: Yeast uses sugar and releases carbon dioxide during fermentation. Moderate warmth can speed activity, while very high heat can damage cells. This interface illustrates a possible pattern; your measurements may differ.