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After marking four small test tubes at the ⅔ full level and filling each of them with their own substances to the mark, we put the yeast inside the test tubes and then filled the test tubes to the top to re-suspend the yeast. We then placed the larger test tubes over them and inverted them to mix the yeast and solutions. Then we put the test tubes in a tube rack and measured the initial height of the air space in the bottom of the small test tube. After that we placed the test tube rack into the incubator for around 20 minutes. Then after the 20 minutes we removed the test tube rack and measured the final height that the smaller test tube was raised. After we used the final gas height and the initial gas height to determine the net change of the gas height.

# data[].attributes.attachment_link.title
Alcohol or ethanol fermentation | Cellular respiration | Biology | Khan Academy

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pyruvate + NADH ->
ethanol + carbon dioxide + NAD+

C3H4O3 + NADH ->
C2H50H + CO2 + NAD+