Introduction
In this experiment, you will use soda bottles to create pitches. You will explore how vibrations, ratios, and fractions work together to influence pitch (the notes).
Watch the following video to get inspired:
Task
Materials:
- 6 Soda Bottles
- 6 Spoons
- Large Bottle
- Tuner App (tunerr.com)
- Liquid
- Ruler
Begin by making some predictions:
- How will the sounds change when you tap the bottles filled with different levels of liquid?
- Will there be any difference when you blow on the tops of the bottles instead of tapping?
Process
1. Create the following table in your notebook. Fill it out for your bottles (each bottle will have a certain amount of air and liquid). Decide as a group which ratios of air/liquid you will test. Adjust as you go! 
__2. Using tunerr.com, record the musical note each bottle creates. Do this by tapping each bottle lightly with the spoon.
3. Try putting the bottles in order from most liquid to least or vice versa. Tap each bottle with the spoon. What do you notice about the corresponding pitches? Which bottle has the highest pitch?
4. What do you think will happen to the pitch when you blow across the tops of the bottles? Try it. How does this compare with the spoon-tapping? Why do you think this is????
5. If all sound is vibration, what conclusions can you draw from this experiement? What is vibrating when the bottles are tapped? What is vibrating when you blow into the bottles? Why does this matter?
Evaluation
Watch the following video to see if you agree with the conclusions:
If you finish early, you can experiment with your larger bottle. Can you create a song? Add the larger bottle as the "bass"!
Conclusion
If you have enough time, try to make 6 pitches that follow a major scale (Do, Re, Mi, Fa, Sol, La). Here are a few songs to try:
