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Another study by Purdue University concluded that it takes an average of 364 licks to get to the center of a Tootsie Pop using a licking machine, while it takes an average of 252 licks when tried by 20 volunteers.
Like the force tests, these used a beaker, 150 mL of water, and a hot plate. I heated the water to different temperatures and measured the height and width of the Tootsie Pop every minute until reaching the center. The next test involved pH. I used a beaker, and 150 mL of water as the basis of my tests.