Yeast is a interesting organism to explore with preschoolers. It is dormant or not active until you give it water and something to eat like sugar or honey. Here is a simple activity to explore with your favorite young person. You will need:
A balloon
A water bottle
Warm water
Yeast
Sugar
Time
Put the water, sugar, and yeast in the bottle. It really doesn't matter how much you put in. In this case I used about a teaspoon of yeast or half a packet and three little packets of sugar. Use the rest of the yeast to touch and even to taste. I swirled it to mix and put the balloon on.
In about two minutes, the balloon was firm, but it took about 20 minutes for it to look like this:
What is happening is that the yeast is converting the sugar to carbon dioxide and that blows up the balloon. It is also what makes bread dough rise. Next we will play with bread...yummo!
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