The hypothesis is that the temperature of the water will affect the amount of dissolved oxygen in the water.

You will prepare three jars of water, measure the dissolved oxygen levels, set one jar at room temperature, one in a heated aquarium, and one in a refrigerator. After five days, measure the dissolved oxygen levels again.

You will need three large jars, an aquarium heater, a water quality kit, a refrigerator, paper, a pen or pencil, and a thermometer.

After five days, the results showed that the jar at room temperature had the highest dissolved oxygen level, the jar heated to 80 degrees Fahrenheit had the lowest dissolved oxygen level, and the jar cooled to 35-38 degrees Fahrenheit had a moderate dissolved oxygen level.

This science project is interesting because it shows how temperature can affect the amount of oxygen in water, which is important for aquatic life.

Variations of this experiment could include testing different temperatures or different types of water.

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