- plastic bottle
- baking soda
First, put the opening of the funnel inside the opening of the balloon. Then add 2 TBSP of baking soda INSIDE THE BALLOON.
Fill the bottle 1/2 way with vinegar and attach the balloon to the opening of the bottle.
Carefully flip the balloon so the baking soda can go into the bottle and chemically react with the vinegar.
Watch the balloon inflate!