The hypothesis is that the rate of bacteria growth in water will decrease after exposure to sunlight.

You will prepare 6 agar petri dishes, and use swabs to collect water from different sources. You will then place 3 bottles of water in direct sunlight for 2 days, and measure the amount of bacteria growth in the petri dishes after 5 days.

You will need 6 agar petri dishes, 6 disinfected swabs, 1 bottle of disinfected water, 1 transparent bottle filled with tap water, 1 transparent bottle filled with water collected from a drain, 1 transparent bottle filled with water from a lake, 1 ruler, and 1 marker pen.

The results showed that the amount of bacteria growth in the petri dishes was much lower for the water that had been exposed to sunlight for 5 days. This proves that the hypothesis was correct - the rate of bacteria growth in water does decrease after exposure to sunlight.

This science project is interesting because it shows how a simple and economical method can be used to disinfect drinking water in underdeveloped nations.

Experiment variations to consider include trying different lengths of time for the water to be exposed to sunlight, and comparing different colored bottles or glass and plastic bottles.

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