Presentation on theme: "The Glow-in-the-Dark Spark Measuring the Luminescence in Glow Sticks Sarah Maloney."— Presentation transcript:
The Glow-in-the-Dark Spark Measuring the Luminescence in Glow Sticks Sarah Maloney
Question Do glow sticks glow brighter in warmer temperatures or colder temperatures?
Hypothesis If the luminescence of glowsticks is measured at different temperatures,then the glowsticks will display increased luminescence, measured in volts, as the temperature increases
Background Information The main chemical in glow sticks in luminol. Luminol is composed of carbon, hydrogen, nitrogen, and oxygen When an atom is excited the electrons go up in energy and energy levels. When they fall back down to their normal spot, they release energy in the form of light photons. The more heat applied to the electrons the more sped up they get, so when they fall back down to their normal energy level they release more light.
Materials Jar Sensor Water bath Ice bath Glow sticks
Procedure Assemble Sensor Set up water baths Set up each glow stick at its designated temperature
Independent Variable: temperature of water Dependent Variable: amount of luminescence (voltage) given off by glow sticks Constants: jar, sensor, probe
Data for 40°C Water 40°C43.6°C8volts 41.7°C10volts 42.6°C10volts 42.4°C9volts 43.1°C9volts
Data for 35°C Water 35°C35.6°C7volts 35.4°C5volts 35.5°C6volts 35.8°C6volts 35.6°C5volts
Data for 24°C Water 24°C25.9°C4volts 23.1°C5volts 23.0°C4volts 24.2°C4volts 24.6°C5volts
Data for 15°C Water 15°C16.7°C0volts 15.9°C0volts 16.2°C0volts 17.1°C0volts 17.9°C0volts
Averages This graph shows the average voltage for each temperature of water that the glow sticks were placed in. Notice that the voltage of the glow sticks increases as the temperature increases. This suggests that when a glow stick is placed in a hotter temperature, it will glow brighter than when it is placed in a colder temperature.
Averages This graph shows the average voltage of the glow sticks at different temperatures with error bars. Notice that the error bars do not overlap showing that the results were accurate. This suggests that when the temperature is warmer, the voltage will be higher in the glow stick.
Trend This graph shows a trend that forms from the data of this experiment. The trend line of this graph shows that as the temperature of the water decreases, the voltage of each glow stick increases. This also verifies that the hypothesis was supported.
Inconsistencies Environment Defect in the water bath
Conclusion Question- Do glow sticks glow brighter at higher temperature or lower temperature? Answer- Glow sticks glow brighter at a higher temperature. The hypothesis was supported
References Casciato, C. (2010, July 16). Ten things to know if youre going to Global Dance Festival. Retrieved January 14, 2011, from going_to_global_dance_festival_denver.php Chaplin, E. (2009, December 1). What Chemicals are in glow sticks? Retrieved October 6, 2010, from Demand Media Property website: The chemical reaction. ( ). How luminol Works. Retrieved October 7, 2010, from Discovery Company website: Chemiluminescence. (n.d.). Retrieved 2010, from JRank website: Leland, J. K., Nacamulli, L., & Yang, H. (2002). Chemiluminescence. In McGraw Hill Encyclopedia of Science and Technology (Vol. 4, pp ). McGraw-Hill. What does luminol do? ( ). How luminol Works. Retrieved October 7, 2010, from