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first of all what you need is: Vinegar baking soda plastic wrap tape container or bottle scisscors drill one eigth drill bit string
drill a hole in the center of the lid or cap so that a piece of string can get through so i recommend the 1 8th drill bit
Then measure out enough string to math where my finger is then take some wrap and make it so that it goes inside the cap but enough so ...
it should look like this and now put a piece of tape on the bottom of the string
then pour vinegar into your bottle
next make a baking soda ball with kleenex
then put the wrap on the top of the container (cap off) and rest the baking soda ball on it then leave the wrapand put the lid on ...
now your done if you made it right when you pull the string a reaction will occour causing it to create c02 gas thus blowing the cap off ...
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