I was at a science museum earlier and I saw a demonstration where methyl alcohol was put in a bottle that had two nails sticking out of the sides. Alligator clips were connected to the nails and something was connected to the clips (I think they said it was a grill starter). There was a cork in the bottle. When the thing connected to the alligator clips was pressed the cork was blown off of the bottle. I don’t know what it was supposed to be a model of but I think it was either an engine or a piston (I missed the beginning of the demonstration). I would like to build one of theses for a project for my AP physics class but I need more detailed directions on how to make it. I mainly need to know what it was that was connected to the alligator clips.