Yeast Project

Welcoming Thomas for a guest post this weekend.

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We decided to do this yeast project after I forgot to put the yeast in bread.  First we looked at the directions from sciencebob.com.  The website said to get a bottle and fill it with about one inch of warm water.  Then it said to add one packet of yeast and swirl it.  After that we needed to add a teaspoon of sugar and swirl that.  Finally we put the balloon on the bottle and put in in a warm spot.  Here is a cool timelapse of the twenty minutes that we left the bottle in a warm place:

How does this work?

The yeast eats the sugar and releases a gas called carbon dioxide.  Carbon dioxide is the same gas that we release when we exhale.  Yeast does not have to eat sugar. It will also eat flour or sugar-related things.  The carbon dioxide makes holes in whatever the yeast is in, as seen below.

This bread has yeast in it.

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Holes

This bread does not.

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No holes (well one or two not from yeast)

After the twenty minutes were up, we took a drop of the yeast solution out of the bottle. We looked at the solution under a microscope.  Here is a picture of the solution taken by focusing the camera lens in the microscope view:

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This was a fun project, but I hope I don’t forget to put yeast in bread again!

One thought on “Yeast Project

  1. This was a very interesting project. I really enjoyed the video and the great photography–especially the photo of the yeast taken through the microscope. Thanks for sharing it with us.

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