Effect of temperature on glow sticks
The materials required for this science fair project:
- 5 beakers
- 1500ml distilled water
- A measurement cylinder
- 25 glow sticks
- A stopwatch
- 2 hot plates
- 5 thermometers
- A bag of ice
1. For this science fair project, the independent variable is the temperature of the water in the beaker, i.e. 5°C, 15°C, 25°C, 35°C and 45°C. The dependent variable is the average length of time the sticks will glow. This is determined by using a stopwatch to measure the time. The constants (control variables) are the size of the beaker, amount of water in the beaker and type of glow stick used.
2. The 5 beakers are labeled “5°C”, “15°C”, “25°C”, “35°C” and “45°C”. Using a measuring cylinder, 300ml of distilled water is poured into each beaker. A thermometer is placed in each beaker.
3. The required amount of ice is added into the 1st and 2nd beakers to maintain their temperatures at 5°C and 15°C. The temperature of the 3rd beaker will be maintained at 25°C, i.e. room temperature. The 4th and 5th beaker are placed on hot plates and the temperatures of the water in the beakers are brought to 35°C and 45°C.
4. The 25 glow sticks are snapped and 5 of them are placed in each beaker. The stopwatch is started and the lights in the room are switched off or curtains are drawn to reduce room light. The time taken for the light in the glow sticks to be extinguished is observed. The average time taken for the 5 sticks in each beaker to stop glowing is recorded and the results are shown in the table below.