Science Weekly: Yeast Experiment

I was recently making soft pretzels at home and realized I have a huge tub of yeast. Since the dough was rising while Cam was asleep I thought she might get a kick out of experimenting with the yeast by itself.

Our question was, what are the best conditions to get yeast to activate? I set out a number of bowls and put yeast in each of them. I also set out some salt and some sugar. Cam added salt and sugar and nothing to the yeast in the bowls. Then we poured in hot, cold and warm water. Technically you don’t need to have sugar in the water, but without adding anything else the yeast never activated. 

It took a good five to ten minutes to really start seeing results, but once it got going, it got going. She had lots of questions about what was going on and wanted to start mixing sugar, salt, and yeast to the bowls and doing a little experimenting of her own. She realized the more sugar you add, the quicker you see results and the more foam you get. 

I think the most interesting take away from this was an interest in our own digestive system. Cam asked where the gas from the bubbles was coming from and I explained that the yeast was eating the sugar and producing gas. That was funny to her because it’s basically a fart. :) But it lead to A LOT of questions about how our bodies work to process food. I explained a little and then got out our Eye Wonder Human Body book to read more. 

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