BACKGROUND
Water is not only a huge part of the environment, but it also plays an essential role in sustaining life. However, not all water is drinkable. In fact, most water is undrinkable. For example, water from a reservoir is not safe to drink before it is chemically treated, filtered and disinfected. Filtration alone is not enough to free the water of harmful bacteria, making it safe for consumption. Exposing clear stream or lake water to direct sunlight(containing UV light), rendering the water drinkable is a known jungle survival technique among trekkers. UV light rays are heard to be an effective way to kill the bacteria in water and, presumably, other contaminants(microscopic organisms) in water Hence, in our experiment, we are trying find out how long the filtered water would have to be exposed to the sun before it can be safe for human consumption.
RESEARCH QUESTION
Hypothesis: The UV light rays from the sun might be able to render the water from the reservoir(filtered) drinkable-by killing the bacteria and other contaminants in the water.
How does the amount of time that the water from the reservoir is exposed to the sun affect the amount of bacteria present in the water at the end of the experiment?
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