Experiment variables:
Independent: The brand of soft drinks used (home brand and regular)
Dependent: The amount of carbon dioxide gas inside soft drink bottles (measured indirectly by the space taken up by the gas)
Controlled: -The type of balloon used
-The amount of liquid inside each bottle
-The size of each bottle
-Consistency in soft drink brand for each trial
-The size of the bottle neck
-Temperature of the drinks
In the equipment list, "Pack of balloons" is changed to:
-Pack of large helium-quality balloons (minimum of 6)
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