Experiments you can do with a 2L bottle

2. Density Column: Teaching density? See how many different layers you can create inside the 2L bottle. Some great liquid options are water, karo syrup, vegetable oil, rubbing alcohol, and soap.

3. Cloud in a bottle: Check out this video clip on how you can create a cloud in a bottle.

5. Climate Demo: Why are the high and low temperatuers in coastal cities close together while inland cities see much greater temperature fluctuations throughout the day? Answer: It’s a lot harder to change the temperature of water than it is to change the temperature of air. Get two 2L bottles and fill one with water while leaving the second bottle empty. Place a thermometer into the opening and secure it with a rubber stopper (or play-doh if you don’t have a stopper). Shine a heat lamp on both bottles and compare the temperature changes.

6. Rocket: Build a water bottle rocket! Here are directions from NASA.

8. Instant Ice: Can you turn a bottle of liquid water into frozen ice within seconds? Wach how here! (Note: I’ve never tried this with a 2L size but know it works well with smaller bottles).

10. Atmosphere Model: What is the most abundant gas in the atmosphere? How much oxygen is actually up there? Grab a 2L bottle and some foam beads from the dollar store and build a model.

12. Composting: Build a micro-composter in a bottle! Pepsi has a free lesson plan here.

13. Lung Model: Build a model of a lung and show students how the diaphragm helps lungs expand and contract. You can find directions here.

15. Cartesian Diver: Get a 2L bottle and fill it with water. Place an eyedropper inside the bottle that is 1/4 of the way full and screw on the lid. (Don’t have an eyedropper? Use a ketchup packet instead. You want the ketchup packet to float, but just barely). Squeeze the bottle and watch the eyedropper sink. As you increase the pressure on the bottle you’ll see water go up into the eyedropper, making it sink.

17. Funnel: Even after you’ve finished using a bottle for one of the experiments listed above, cut off the top and save it for a lab that requires a funnel!

Any other uses you know of? Drop me a comment!