Cold Air Balloon
Use a bottle, a few readily available ingredients, and an endothermic reaction to blow up a balloon in this fun and simple science experiment for kids.
- Empty plastic bottle
- Baking Soda
- Use the funnel and add a tablespoon or two of baking soda into the balloon.
- Wipe any backing soda from the funnel and place it into the bottle.
- Pour about a half a cup of vinegar into the bottle.
- Fit the balloon over the opening of the bottle making sure no baking soda falls inside.
- Now lift the balloon and let the baking soda fall and mix with the vinegar.
- Observe as you Cold Air Balloon inflates.
- Feel the bottom of the bottle. It will be cold.
How it Works:
When vinegar and baking soda mix, an endothermic reaction occurs. This produces carbon dioxide which inflates the balloon. The endothermic chemical reaction will also lower the temperature in the area surrounding the vinegar and baking soda so significantly that you will be able to easily notice the change in temperature.
Make This A Science Project:
Will a different acid such as citric acid inflate the balloon? What happens if you increase the amount of vinegar and/or baking soda?