Combining vinegar and baking soda creates a gas - carbon dioxide. The gas fills the bottle and then moves into the balloon inflating it. Charlotte got a kick out of this one!
Add some vinegar to a soda or water bottle and fill the balloon halfway with baking soda. Cover the top of the bottle with the ballon making sure you don't spill the baking soda prematurely. When ready, lift the balloon and let the baking soda fall into the vinegar. Watch it fizz, bubble, and expand the balloon!
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