|Plastic bottles before processing|
photo source Wikipedia
It began with me telling them that I had read somewhere that the same amount of plastic went into the hard, large plastic test tubes, the small bottles of juice (the kind with the same tops as the 2 liters) and the regular 2-liter soda bottles. The larger the bottle size, the more the plastic is blown out, making it thinner. Then James said that if the two bottles were put on a balance scale then, they would balance out. This lead to our testing out his hypothesis.
We used a pole and found the spot at which it balanced. We put a piece of tape at this point so we could always find it. We then tied two pieces of 6 inch string to the pole, four inches in on each side. We confirmed that it still balanced at the same spot. Then we tied to the other end of the strings two of the different sized bottles.
We then noted that the pole still balanced.