July 4th Science – Exploding Watermelons
Over the years, the exploding pumpkin demo is right up there at the top of my short list for my all time favorite, crowd-pleasing science demonstration. But who wants to wait a whole year just to do the demo again? That’s why we’re working on the fine art of watermelon carving… with the aid of a tiny chemical reaction… okay, it’s an explosion. We just substituted a big, juicy watermelon in place of the pumpkin and pulled the trigger. Since the walls of a watermelon are not necessarily as strong as a pumpkin, sometimes the whole darn thing explodes… but that adds to the fun. Check out the video. (If the video doesn’t play, click on Exploding Watermelon Experiment.)
I love Halloween. One of my favorite activities is to “carve” pumpkins using a simple reation inside the fruit. First, you carve the face then carefully replace pieces. After creating a reaction by generating a gas inside and igniting it (ask your local chemistry teacher for the details) the face pieces are blown off with a small explosion.
