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Dissolved oxygen and the temperature of waterScience project video


  1. Prepare three large jars or beakers of with water and label the jars A, B, and C. Check the DO level using the water quality kit.
  2. Record the DO level for each jar on a piece of paper.
  3. Set jar A in a safe place and let it sit for five days at room temperature.
  4. For jar B: Place the aquarium heater and set for 80 degrees Fahrenheit (27 Celcius.). Maintain the temperature for five days.
  5. For jar C: Place the jar in the refrigerator for five days. The temperature within the refrigerator should typically be at 35-38 degrees Fahrenheit (2-3 degrees Celcius.)
  6. At the end of five days, check the DO level for all three jars.
  7. What changes can you observe in the DO of each of the three jars?
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    Complexity level:
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    Does not include time required to obtain a water quality kit, which may be purchased online or at an aquarium shop.
    Material availability:
    Safety concerns:

    This science fair project involves an electric aquarium heater and water as well as chemicals contained in the water quality kit. Appropriate care should be taken to avoid injuries.