2. Methods

Equipment List:
-       12 bottles of coke (500ml)
-       1 liter BioChamber

-       1 beaker

-      1 CO2 gas sensor

-      1 Data Logger

-      1 Stainless steel temperature probe

-        Cardboard Box
-        Stopper

- 2 High-power lamp



Stainless steel temperature probe
Data logger
High-powered lamps
1 liter BioChamber





Procedures:
1. 250ml of Coke must be poured away within 5 seconds, to minimise the carbon dioxide escaping from the bottle.

2. For the first bottle, pour 250ml of the Coke drink away and close the cap immediately after pouring the Coke away.This is to ensure that the least amount of carbon dioxide escape and this set-up has the highest amount of carbon dioxide.

3. For the second bottle, pour 250ml of the Coke drink away and close the cap after leaving it out open for 30 seconds. This is to ensure that some carbon dioxide escape and this set-up has the second highest amount of Carbon dioxide.

4. For the third bottle, pour 250ml of the Coke drink away and close the cap after leaving it out open for 60 seconds. This is to ensure that a large amount of carbon dioxide (more than set-up 2) escape this set-up has the second lowest amount of carbon dioxide.

5. For the fourth bottle, pour 250ml of the Coke drink away. Shake the Coke for 10 seconds and leave it uncapped overnight before closing the cap. (By shaking the bottle, you are making it produce a lot of pressure, hence forcing the carbon dioxide out of the bottle.) This is to ensure that almost all the carbon dioxide escape and this set-up has the lowest amount of carbon dioxide.

6. Pour each set-up (one at a time) into the Bio chamber with the CO2 gas sensor and the temperature probe inserted.

7. Start the data collection on the data logger. (360 sample/h, 24h total)

8. Plot the data into a table


9. Repeat the experiment 1 more time, then find the average of the results.


10. After that, plot a graph of the different concentration of carbon dioxide against the temperature using the average results



Final set-up

















































Independent variable (Variable that is changed)
The amount of Carbon Dioxide in the soda bottle. (Pour out the same amount of coke of 250ml. Leave the bottle open for different duration of time, thus releasing the different amount of carbon dioxide, so as to get different concentration of carbon dioxide in each set-up)


Dependent variable (Variable that is measured)
The temperature of the Air in the soda bottle.


Risk and Management Table:



Data Analysis:
1.  Measure the temperature and amount of carbon dioxide inside each Coke bottle using the carbon dioxide gas sensor and the temperature probe connected to a data logger.
  
2. The data logger will record the data over 24 hours (360 sample/h).
 
3. Plot 2 graphs. The first graph is temperature (y-axis) against time (x-axis). The second graph is the concentration of carbon dioxide (y-axis) against time (x-axis) The gradient of the graph will not be linear as the temperature will be decreasing at some point of time until set-up 4, but will rise when it reaches after set-up 4.
  
4. From the graph, we can conclude if the higher the concentration of carbon dioxide, the higher the temperature will be. Even after the carbon dioxide is diffused, the temperature will remain.


5. We will use the data collected from the datalogger and compare it with the other set-ups. The bottle of Coke that has the lowest concentration of carbon dioxide should have the lowest temperature.

6. We plot two graphs, one graph of temperature against time, another of concentration of carbon dioxide against time.








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