- a stand
- 2 empty plastic boxes; smaller and bigger so that one could be a kind of lid to the other
- a small piece ( ball) of calcium carbid ( not wet or old)
- water in the wash bottle
Carbide reacts with water and in the reaction we obtain a gas - acetylene C2H2:
CaC2 + 2 H2O = C2H2 + Ca(OH)2
Acetylene is flammable and it burns silently if it's pure. When it is mixed with air , explodes and throws away the upper box.