Water Balloon in a Bottle
This fun science trick is actually an awesome demonstration of air pressure
If we asked you to blow up a balloon inside of a bottle or, better yet, fill that balloon with water, you'd probably think that it's no problem. Think again! The Water Balloon in a Bottle experiment will show you just how powerful air pressure actually is, and you'll get to play some fun tricks on your friends. Having fun with friends and learning along the way? It's a hands-on science two-for-one!
- One liter bottle
- Duct tape
- Tack or pushpin
- Let's start by trying to blow up a balloon inside of a one liter bottle. No problem right? Put the balloon into the bottle, wrapping the open end around the mouth of the bottle.
- Take a deep breath and blow up the balloon. You can't do it? Oh no! What's going on here?
- We'll answer that question in a bit. For now, poke a hole in the bottom of the bottle using a tack or pushpin.
- Take another deep breath (remember how hard… er… impossible it was to blow up the balloon last time) and try blowing up the balloon.
- That was easy! While the balloon is still inflated, cover the hole in the bottom of the bottle with a finger and take your mouth off of the balloon. It stays inflated!
- Take your finger off of the hole in the bottle and the balloon will deflate. Wow!
- Now let's add some water.
- Blow up the balloon and cover the hole in the bottle with a piece of duct tape. Make sure that the tape will be able to hold for a while.
- Fill the blown up balloon with water and tie off the balloon. You've achieved the water balloon in a bottle.
- You were promised a trick to play on your friends, so here you go!
- Once you've blown up the balloon and filled it with water, leave the balloon open, and cover the hole in the bottom with your finger. Show a friend that you've successfully put a water balloon in a bottle. When they attempt to check whether or not there is water in the balloon, let your finger off of the hole in the bottle. The water blasts out and gets them all wet!