alt Hacker NewsI would've loved that as a kid. For that matter, I did actually fill some balloons with hydrogen using vinegar and something (might've cut some magnesium off one of those primitive fire starters, or I might've used a weaker metal, can't quite remember). I think I used the glass tube Costco used to use as a vanilla bean container to strap the balloon onto.
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garlic_enjoyer • yesterday at 8:33 PM
Zinc and vinegar is what you're looking for. Our high school science class had us fill plastic pipette bulbs to make rockets.
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My choice was copper sulfate + table salt + aluminum wire. Acids were hard to come by, but copper sulfate was easily available as a treatment for plants, and did not need such careful handling.