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Project title Bacteria in water coolersFeatured science projectScience project video
Difficulty Level High school
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This science fair project was done to find out the amount of bacteria in water coolers. The testing was done by comparing water from water coolers and tap water. 

Instructions preview
1. For this science fair project, the independent variable is the source of the water – ie: tap water or water cooler water. The dependent variable is the size of the bacteria growth in the petri dishes. This is determined by measuring the size of the bacteria growth using a ruler. The constants (control variables) are room temperature, the amount of sunlight and the ingredients in the petri dish agar. 2. Two petri dishes are prepared and stored in a refrigerator. The petri dishes are brought to room temperature before the start of the science fair project by taking .....
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