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Bacteria and thawing methodsFeatured science projectScience project video

Conclusion

The hypothesis that the meat thawed in  the microwave oven experiences the least  bacteria contamination is proven to be true.

Bacteria will contaminate meat very quickly. Leaving meat to thaw at room temperature for too long can cause the food to be unsuitable for consumption. Thawed meat should always be cooked immediately. .
 

Also consider

The science fair project can be repeated by varying the types of food.

The experiment can also be repeated by using other thawing methods (eg. thawing the meat in a container filled with water, or in a disinfected plastic bag). .
 

References

The truth about irradiated meat - http://www.mindfully.org/Food/2003/Irradiated-Meat-TruthAug03.htm

Bacteria that cause food borne illness - http://www.infoplease.com/ipa/A0762206.html

What is the best way to thaw frozen meat? - http://www.wisegeek.com/what-is-the-best-way-to-thaw-frozen-meat.htm
 

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Complexity level:
7
Project cost ($):
30
Time required:
2 day for preparation, 5 days for science fair project
Material availability:
Access to laboratory equipment (eg. petri dishes)
Safety concerns:

Always follow laboratory safety guidelines and always practice sterile technique when handling microbes. Never have any food or drink at your workstation and always thoroughly wash your hands with disinfectant soap or alcohol before leaving your workstation. Always dispose of used material in a biohazard bag. If none are available, the bacteria should be destroyed with bleach before being disposed of.