Some fun experiments to undertake with bubble gum include testing whether or not sugar content affects maximum bubble size and testing which bubble gum stretches the most after being chewed. Both of these experiments are designed to help understand the scientific method by forming and testing a hypothesis.
Testing whether or not sugar content in bubble gum impacts the size of the bubbles produced can be used to test several brands of bubble gum and gives an a strong, simple introduction to the scientific method. By blowing and measuring bubbles with each type of gum and comparing the sugar per piece, a clear conclusion can be made. Similarly, the ductility of bubble game can be tested by affixing a chewed piece of gum to a piece of paper and measuring how far it stretches.