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Why Soda Fizzes — Boyle's Law Demonstration

Active Time
30-45 minutes
Total Project Time
30-45 minutes
Key Concepts
Boyle's Law, gas, volume, pressure

Introduction

You have probably cracked open a soda before to see the liquid fizz right up out of the bottle, creating a huge mess. Why does that happen? It has to do with the carbon dioxide gas that is added to the liquid to make it fizzy. Opening the bottle releases the built-up pressure by the gas inside, causing the gas-liquid mixture to rush out the bottle. In this activity, you will demonstrate with the help of air- and water-filled balloons how a gas changes volume depending on its pressure.

Credits

Svenja Lohner, PhD, Science Buddies
This activity is not appropriate for use as a science fair project. Good science fair projects have a stronger focus on controlling variables, taking accurate measurements, and analyzing data. To find a science fair project that is just right for you, browse our library of over 1,200 Science Fair Project Ideas or use the Topic Selection Wizard to get a personalized project recommendation.

Materials

  • Small balloons such as water balloons (2, additional 2 optional)
  • 60 mL syringe (without needle) Note: the syringe needs to be airtight.
  • Scissor
  • Tap water
  • Food color (optional)
    Materials to do the Boyle's law activity

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Active Time
30-45 minutes
Total Project Time
30-45 minutes
Key Concepts
Boyle's Law, gas, volume, pressure