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Which Bathroom is the cleanest?

Which Bathroom is the cleanest?. Katrina Sennett 4/23/10. Abstract Which Bathroom is the Cleanest?.

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Which Bathroom is the cleanest?

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  1. Which Bathroom is the cleanest? Katrina Sennett 4/23/10

  2. AbstractWhich Bathroom is the Cleanest? The purpose of this experiment was to find out whether my bathroom at home, the bathroom at Friendly’s, or the McDonald’s bathroom was cleanest .I ordered petri dishes and agar online. After preparing the petri dishes with the nutrition agar, I swabbed bacteria samples from each bathroom. I hypothesized that my bathroom would be the cleanest of the three. At first, I thought I was wrong and Friendly’s had been the cleanest, for there was the least bacteria growing in the Friendly’s petri dish. However, my bathroom at home ended up being the most bacteria-free, after watching and observing the dishes for several days. I hypothesized correct and my personal bathroom was the cleanest.

  3. Planning Procedure • Gather Materials. • Prepare 6 Petri dishes with agar. • Roll the cotton swabs onto each toilet seat of McDonald’s, Friendly’s, and your bathroom at home (2 cotton swabs for each restroom). • Swab each cotton swab onto the agar in the 6 separate Petri dishes. • Store the Petri dishes into a cool and dark place • Examine the growth of the bacteria.

  4. Planning Continued Materials • Bag of agar • Water • Measuring cup • 6 petri dishes • 6 cotton swabs • Something that can be used for stirring, such as a spoon

  5. Data • McDonald’s had the dirtiest bathrooms. • Chunks and colonies of bacteria were all around the agar. • A different kind of bacteria formed in the McDonald’s petri dish than in the other dishes. It was small and redish in color. • Friendly’s bathrooms were the second cleanest. • There were a lot of small colonies of bacteria in the Friendly’s petri dish, but not as much as McDonald’s. • One of the Friendly’s petri dish wasn’t clear as the other ones. It was slightly foggy. • In one of the petri dishes from my bathroom the bacteria formed one big colony. • The other petri dish from my bathroom had little bacteria growth. • My personal bathroom was the cleanest. Ewww!

  6. Conclusion I hypothesized my bathroom would be cleanest. My Hypothesis was correct. The order of bathrooms from cleanest to dirtiest was Home, Friendly’s, and McDonald’s. During this experiment I’ve learned… • My personal bathroom is the cleanest of it, McDonald’s, and Friendly’s. • McDonald’s is a very filthy bathroom! • I’ve learned how to make agar using the agar powder. • How to use petri dishes.

  7. Sources • Bennett, Kathrine. "California State Science Fair 2007 Project Summary." . 2007. California State Science Fair. 30 April. 2010 <http://www.usc.edu/CSSF/History/2007/Projects/J1402.pdf>.

  8. Acknowledgements • I’d like to thank my parents for taking me around to get samples, buying and ordering the bacteria growing kit, and assisting me with my display board.

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