Erupting Pumpkin

We have been having SO much fun the past couple of months doing lots of science experiments, and this erupting pumpkin is one of our favourites so far. It's quick and easy to do, but it also doesn't need many ingredients making it affordable for you to do a few runs of it.

I've included directions below, and also attached the video of us carrying out the erupting pumpkin experiment so you can see what it looks like. It'll be perfect for your classrooms during this autumn / fall season!

You will need;
  • a pumpkin - we went for a small one
  • a tray - to contain the mess, we used foil roasting trays
  • vinegar
  • liquid dish soap
  • baking soda - we used bicarbonate of soda


  1. Cut a circle out of the top of your pumpkin and empty the insides of seeds/gunk etc. We emptied it as much as possible but not fully and it didn't affect us by having some bits left inside.
  2. Add 1 cup of baking soda/bicarb into the pumpkin
  3. Add some fairy liquid - we just squeezed about 3-4cm out of the bottle (see video)
  4. Add vinegar - just keep adding until the pumpkin starts to erupt. You can also keep on adding to the pumpkin to keep it erupting! It's lots of fun.
Let me know how you get on with your erupting pumpkin, or if you've been trying any more fun science experiments.

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