Fill and freeze a glass bottle, and see the natural power of ice in action.
- Sealable glass bottle
- Plastic container (to hold the bottle bits post-explosion)
- Cuts and scrapes
How It All Went Down:
I can think of multiple times we accidentally exploded a bottle in the freezer as kids, but flipping through the 50 Dangerous Things book, I realized my kids have never experienced this. If you’re looking for somewhere small to start on your own 50 Dangerous Things journey, this is a good one. You probably already have everything you need, and it’s easy to do while you’re home and doing other things. Bonus: kids get really excited about breaking things, especially something as forbidden as glass.
The author suggests using a resealable soda bottle, but all of our glass soda and beer bottles had bottle caps, not screw tops. Empty glass vinegar, wine, or liquor bottles will all work. Just remember – the bigger your bottle, the longer it will take to freeze … and the bigger the mess!
Fill the glass bottle with water, and screw on the cap. Using a Sharpie, draw on the bottle where you think it will break. Place the bottle in a plastic container. This is a must, unless you want to spend an entire day picking broken glass out of your freezer. You can also cover the plastic container with a cloth to keep any stray glass shards from flying around your freezer.
Now wait for your bottle to freeze. A standard home freezer will take at least an hour to freeze a small glass bottle. We used our deep freezer, which is colder and freezes faster. After an hour has passed, check the bottle by gently rocking the plastic container to see if the contents are frozen. Check back every 30 minutes or so to see if your bottle has broken.
Once the bottle has exploded (bonus points if you hear it!), carefully remove the plastic container and the broken bottle from the freezer. Observe your bottle and hypothesize about why it broke in the spots it did. You can repeat the experiment with different shapes and sizes of bottles, and compare how long they take to freeze and how differently they explode.
It’s kind of amazing how something as innocuous as freezing water can cause so much damage. How do you topple a mountain? Expose it to season after season of freezing water, which expands as it freezes and forms large cracks.
We joke about how most of the tasks we’ve completed in the 50 Dangerous Things book really aren’t dangerous at all, but this task gets the honors of producing our first real injury. I warned Eli over and over again that broken glass can be ridiculously sharp. Sure enough, he couldn’t resist and he sliced his finger open. I’ll warn you as well, but if your kids are anything like mine, it takes a teachable moment for the lesson (and the bandaid) to stick.
You can read about the rest of our experiences with 50 Dangerous Things. Inspired by Gever Tulley’s book 50 Dangerous Things (You Should Let Your Children Do).