How does packaging affect the carbonation of soft drinks
The materials required for the experiment:
- A glass bottle of Coca Cola 200ml
- A PET bottle of Coca Cola 500ml
- A can of Coca Cola 325ml
- A digital weighing scale (which measures in milligrams)
1. For this experiment, the independent variable is the packaging of the Coca Cola beverage i.e. in a glass bottle, a PET bottle and aluminum can. The dependent variable is the amount of carbon dioxide released from the Coca Cola beverage. This is determined by using a digital weighing scale to check the weight of the bottle before and after releasing the gas in the beverage. The constants (control variables) are the room temperature and the type of beverage and the amount of beverage.
2. The Coca Cola beverage in the glass bottle, the PET bottle and an aluminum can are left to reach room temperature.
3. The initial weight of the Coca Cola beverage in the glass bottle is checked. The bottle is shaken 10 times. The bubbles are allowed to settle. Without letting any liquid escape from bottle, the cover is opened gently and the carbon dioxide gas allowed to escape. The weight of the bottle is measured once more and the weight difference recorded in the table below.
4. The top of the bottle is covered with a thumb or the palm and the bottle shaken 10 times again. The bubbles are allowed to settle and the weight measured once more. The difference in weight compared to the initial weight is calculated and recorded in the table below.
5. Procedure 4 is repeated 8 times and the results recorded in the table below.
6. Procedures 3, 4 and 5 are repeated with the Coca Cola in the PET bottle and the aluminum can. The variance in weight is recorded in the table below.