Vernier Software and Technology
Vernier Software & Technology

Yeast in Action

Figure from experiment 8 from STEM 2 with Vernier and LEGO® MINDSTORMS® NXT


Yeasts are one-celled micro-organisms. They consume oxygen and exhale carbon dioxide just like humans in a process called fermentation. The fermentation process is characterized by foaming and bubbling which helps for raising bread dough or making alcoholic beverages. Yeast cells digest food to get energy for growth. Their favorite food is sugar. If yeast cells receive enough food and air, and are at a comfortable temperature they grow very quickly. Yeasts can also break hydrogen peroxide down into water and oxygen gas. In this activity, you will investigate yeast activity in a cola, milk, and antacid (acidic, neutral, and basic mixtures). Rather than measuring carbon dioxide, however, you will use a Gas Pressure Sensor to measure the pressure caused by the production of oxygen gas when yeasts are added to hydrogen peroxide.


In this experiment, you will

  • Use a Gas Pressure Sensor and NXT to measure pressure in yeast mixtures.
  • Measure and compare yeast activity in acidic, neutral, and basic mixtures.
  • Make a conclusion about yeast activity.

Sensors and Equipment

This project/activity features the following Vernier sensors and equipment.

Additional Requirements

You will also need NXT Sensor Adapter and a LEGO MINDSTORMS NXT robotics system.

STEM 2 with Vernier and LEGO® MINDSTORMS® NXT

See other experiments from the lab book.

2First-Class Levers
3Audio Assistant
6String Tension Tester
7Gas Pressure
8Yeast in Action
9Grip Strength
10Cartesian Diver
12Lemon Battery
13Battery Tester
14Solar Cells
15Solar Tracker
16Mapping a Magnetic Field
18Migrating Robot
19Magnet Finder
20Mine Sweeper

Project/activity 8 from STEM 2 with Vernier and LEGO® MINDSTORMS® NXT Lab Book

<em>STEM 2 with Vernier and LEGO<sup>®</sup> MINDSTORMS<sup>®</sup> NXT</em> book cover

Included in the Lab Book

Vernier lab books include word-processing files of the student instructions, essential teacher information, suggested answers, sample data and graphs, and more.

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