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In response to
"Need some help from the TTIS department and/or nubby if he's around...so we're working on the science projects."
by
Jim
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It's not necessarily more CO2 -- it could be a combination of additives that releases CO2 more quickly.
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The volume of soda spewed out is a function of several variables, which you could test scientifically. The driving force is CO2 dispersal out of solution (it's dissolved in the soda and then released quickly), and at least two things can affect that rate: (1) the amount of CO2 in solution initially; and (2) how quickly the CO2 is released.
If you want to test the amounts of CO2 released, find some way to capture the CO2 as it's released from solution over a day or two. For example, a cheap and easy way to do this is buy a 2L bottle of each type of soda, open each bottle, stick a balloon over the spout, and set the bottles in a warm location for about 24 hours. The CO2 will escape from the soda and be trapped in the balloon, then you can estimate the volume of CO2 trapped by computing the volume of each balloon.
If you're measuring volume of soda spewed from a can, you can also vary the size of the opening (e.g., opening a shaken can normally versus punching it open with a nail), the shape and size of the can, temperature (e.g., refrigerated, room temperature, and heated), and type of soda (e.g., regular versus diet, caffeinated versus non-caffeinated, etc.).
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