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no helium! just fill a water bottle 1/3 full with vinegar with a funnel. With another dry funnel, pour baking road into balloon (about 1/2 way). Cover top of bottle with balloon. DON'T LET BAKING SOADA SPILL INTO THE BOTTLE. Then lift balloon and let baking soda fall into vinegar. Mixture will fizz and expand balloon!
A volcano in a mug. Neat idea to show kids how they work. Much more accurate than the old baking soda/vinegar idea.
Color mixing experiment with baking soda and vinegar eruptions - a fun and simple twist on a classic experiment for kids.