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Build a rocket

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Find a film canister, toilet paper, Alka-Seltzer and water — now you have everything you need to build a rocket!

"For every action there is an equal and opposite reaction." - Sir Isaac Newton

Alka-Seltzer tablets contain citric acid and sodium bicarbonate. When dropped in water the two ingredients mix, causing a chemical reaction that produces the CO2 gas. The gas builds until the bottle can't contain it anymore, thus Newton's 3rd law.

link: Small Step for Man

**related: Blow up a balloon

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