Yeast Balloon Experiment for Kids with FREE Worksheet

Kids will be amazed as they learn about the purpose of yeas with this Yeast balloon experiment. This blow up a balloon with yeast project is fun for kindergarten, first grade, 2nd grade, 3rd grade, 4th grade, 5th grade, and 6th graders too. All you need are a few simple materials to see what yeast does in bread. Simply print yeast balloon experiment worksheet and you are ready to try this simple, but fascinating science experiment for kids.

Yeast balloon experiment

I love simple meaningful experiments that teach and WOW at the same time. This yeast and balloon experiment is a perfect mix of educational and FUN. This yeast and sugar balloon experiment is fun for kindergartners, grade 1, grade 2, grade 3, grade 4, grade 5, and grade 6 students. Plus we’ve included the yeast balloon worksheet for students to work through the scientific method as they made a hypothesis and conclusion too.

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Yeast balloon experiment worksheet

Start by scrolling to the bottom of the post, under the terms of use, and click on the text link that says >>_____<<. The balloon worksheets pdf file will open in a new window for you to save your freebie.

Yeast and balloon experiment

All you need are a few simple materials to try this science experiment:

• 1-2 clean, empty water bottles  (16 oz. or smaller
• 1 packet of active dry yeast
• 1 teaspoon of sugar
• 1-2 balloon
• warm water
• worksheet
• pen

Blow up a balloon with yeast

Fill the the empty bottle with about one inch of warm water. Add all of the yeast packet and gently swirl the bottle a few seconds. When yeast is cold or dry the micro organisms are resting. By adding warm water the yeast dissolves, it becomes active – it comes to life! Don’t bother looking for movement, yeast is a microscopic fungus organism.

Add the sugar and swirl it around some more.  Like people, yeast needs energy (food) to be active, so we will give it sugar.

yeast sugar balloon experiment

Blow up the balloon and release a few times to stretch it out then place the empty balloon over the neck of the bottle.  The yeast is beginning to consume “eat” the sugar energy.

yeast and sugar balloon experiment

Let the bottle sit in a warm place for about 20 minutes and observe what happens.

What does Yeast do Explanation

As the yeast feeds on the sugar, it bubble, grows, and expands. It also produces a gas called carbon dioxide. With no place to go but up, this gas slowly fills the balloon. A very similar process happens as bread rises. Carbon dioxide from yeast fills thousands of balloonlike bubbles in the dough.

Yeast and balloon experiment worksheet

Fill out your worksheet as you begin, watch the experiment, and draw conclusions to teach kids about the scientific method and record your findings.

yeast experiments for kids

Try this experiment as explained above AND another one without the sugar. Ask the kid what they think will be different as a result.

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