Balloon Blow-Up Science Experiment

mother and two children doing a balloon blow-up science experiment at home

Blow-Up a Balloon Using Science! Ages 3+

Using items easily found at home, you can blow up a balloon without using your mouth or your own breath! This isn’t magic; it’s science!


This experiment demonstrates how states of matter can change – mixing a solid with a liquid to create gas! The science, behind this balloon baking soda experiment, is the chemical reaction between the base – baking soda – and the acid – vinegar. When the two ingredients mix together the balloon baking soda experiment gets its lift! The gas produced from the two ingredients is carbon dioxide or CO2.


  • Inflate
  • Fizz
  • Gas
  • Expand
  • Observe
  • Extra Credit Word: Exothermic (absorbs heat, so it feels cold)


  • Empty 12-16 oz soda bottle (or any bottle about that size with a small neck)
  • Balloon
  • Baking Soda
  • Vinegar
  • Small funnel
  • Teaspoon
  • Small measuring cup


  1. Have your children scoop the baking soda into the balloon using the funnel
  2. Help your children put the vinegar into the flask using a pipette or small measuring cup
  3. Next, attach the balloon to the top of the flask; make sure not to pour the baking soda into the
  4. Ask your children what might happen, and why.
  5. Count to 3 and everyone holds up their balloon so the baking soda falls into the vinegar,
    creating a chemical reaction and blowing up their balloon.
  6. Let the kids know what will happen scientifically – SCIENCE:
    a. When baking soda and vinegar are mixed together, it creates a gas called carbon dioxide. The gas begins to expand in the bottle and starts to inflate the balloon.  The more gas that is created, the larger the balloon will inflate.


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