Stickiness is serious business. Scientists study it, throwing around words like "viscoelasticity" and examining the super-sticky feet of little lizards called geckos. So explaining the stickiness of candy is complicated.
But let's start by explaining why sugar is sticky. Sugar molecules are made up of carbon, oxygen, and hydrogen atoms. Together, they create tiny sugar crystals, and bunches of crystals all together are what you find in your sugar bowl.
If you add water (moisture), the sugar crystals dissolve, breaking the chemical bonds between the sugar molecules. Then the sugar sticks to whatever it touches.
Would it surprise you to know that sugar is an ingredient in some glues? Probably not, if you've every held a piece of candy in your hand or put it in your pocket.
Dentists (and parents) often tell you not to eat too much sticky stuff. For someone with braces, sticky candy is a problem because it can get stuck in all those wires and brackets. Even if you don't have braces, sticky candy can stick to your teeth and lead to cavities. If you do eat candy, be sure to brush your teeth afterward.
In this experiment, you'll play around with candy to see which is the stickiest. These factors will affect the stickiness: warmth, moisture (water), and how much oil the candy contains.
© Loralee Leavitt. Used with permission.
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