Select personalised ads. Apply market research to generate audience insights. Measure content performance. Develop and improve products. List of Partners vendors. Share Flipboard Email. Anne Marie Helmenstine, Ph. Chemistry Expert. Helmenstine holds a Ph. She has taught science courses at the high school, college, and graduate levels. Facebook Facebook Twitter Twitter. Updated October 17, Cite this Article Format.
Helmenstine, Anne Marie, Ph. How Do Lightsticks Work? Are Glow Sticks Endothermic or Exothermic? Sulfuric Acid and Sugar Demonstration. The Science Behind Firecrackers and Sparklers.
Elephant Toothpaste Chemistry Demonstration. Hydrogen peroxide and phenol are both irritants and in extreme reactions may cause tissue swelling, nausea and vomiting. Some of the dyes may be potential carcinogens. The length of time an activated glow stick will shine and its brightness depends on both the concentrations of the reactants and the temperature of its usage. At higher temperatures, the chemical reaction is faster, so the stick will emit a brighter light but for a shorter time.
At low temperatures with a slower reaction time, the dim light produced will last a longer time. The kinetics of the reaction causes the stick to be brighter immediately after the breaking of the inner vial and then to start to fade.
If a stick is refrigerated prior to activation, the stick will emit a more even level of light during the reaction. The color of the glow stick will depend on the dye contained within the inner tube. The reaction continues for several hours, and your necklace will glow until all the fuel is used up. Chemical reactions tend to be slowed by cold, and this one's no exception. You can test this by buying two glowing necklaces, and putting one in your cooler. The colder one will keep glowing longer, because its chemical reaction is taking place more slowly.
It's a chemistry experiment you can wear! Give Now ». Noon Edition. Home Archives About Contact. How Do Glow Necklaces Work?
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