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Does Light and/or Temperature Affect the Rate at Which Foods Spoil?

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Jonah Robbins

on 10 January 2013

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Transcript of Does Light and/or Temperature Affect the Rate at Which Foods Spoil?

Jonah Robbins
7th Grade
Lisa Willard
This topic was chosen for me by my teacher.
Does Light and/or Temperature Affect the Rate at Which Foods Spoil? Purpose The purpose of my experiment is to determine the rate at which foods spoil when affected by light and temperature. The knowledge gained from this experiment will help others know how to properly store food and drinks. Hypothesis When food absorbs more light, whether natural or artificial light, then the food will most likely spoil. Background Research foodsaftetysite.com. Dr. Angela Fraser, Associate Professor/Food Safety Education Specialist. Clemson University. Clemson, SC. 2012. From this site, I learned about the different ways that food and drinks spoil. Light, oxygen and temperature changes are some of the ways that affect food and drinks. Source 1 Background Research Source 2 Background Research Source 3 Background Research Source 4 Background Research Source 5 Experimental Design The independent variable is the amount of light and containers the bread is placed in. The dependent
variable is the rate at which the bread spoils.
My controlled variable is the temperatures the bread is
stored in. Materials 6 Slices of White Loaf Bread
3 Plastic Bags with Ties


Procedure 1. Gather 6 pieces of bread that are at the day of expiration.
2. Place 2 pieces of bread in the plastic bag and use the ties to seal it. Repeat this process, so that there is 3 separate sets of bread in the bags.
3. Place the first bag of bread in the freezer.
4. Place the second bag of bread in the refrigerator.
5. Place the fourth bag of bread on a lighted counter top. Data Analysis Mold Growth Results The results from this experiment was the bread that was kept in the freezer showed no affects from the lighting or temperature. The bread in the refrigerator started showing the growth of mold around day six. The bread left on a lit counter top showed the growth of mold around day one. The bread from the refrigerator was showing about twenty five percent covering of mold. The bread that was left out on the counter top was at eighty percent coverage. My results are related to the purpose in that it showed some proper ways to store food. Conclusions The main results of my experiment were that light and temperature affects the rate at which foods spoil. The results did support the hypothesis in that the bread that was left out in the light and at room temperature, spoiled quicker than those in the darkened and cooler freezer and refrigerator. The results were comparable to those I read in my background research because in each experiment, the light affected the rate the food spoiled. Some possible explanations for the results could come from the expiration date of the food used, and the temperature of the setting. To improve and make further studies on this experiment, I would add more settings and temperatures. Bibliography education.com. Bold Mold: What factors drive mold growth. Education.com Inc. Copyright 2006-2013. From this site, I learned how, what, and where mold can grow. This site also has great tips on how to keep food edible for as long as possible. A Bread from freezer
B Bread from refrigerator
C Bread from counter top Days % covered by mold Ehow Food . Drink. Demand Media Property. 1999-2013. This site explains how light has affect on the rate that foods spoil. It explains about the type of light, effects, chemical changes, and preventions in dealing with the rate that food spoils. USDA Food Safety and Inspection Services. Molds on Food: Are They Dangerous? March 4, 2010. This site has a great fact sheet on mold! It also has a chart on the foods, how to handle them and the reason why they are to be handled in certain ways. idiotguides.com. The Complete Idiots Guide. Science Fair Projects: Which Foods Do Molds Love Best? By Nancy K. O’Leary and Susan Shelly. This is a very interesting site about a science fair project on which foods molds love the best. A great site with ideas for charting and conducting your experiments. foodsaftetysite.com. Dr. Angela Fraser, Associate Professor/Food Safety Education Specialist. Clemson University. Clemson, SC. 2012. education.com. Bold Mold: What factors drive mold growth. Education.com Inc. Copyright 2006-2013. Ehow Food . Drink. Demand Media Property. 1999-2013. USDA Food Safety and Inspection Services. Molds on Food: Are They Dangerous? March 4, 2010. idiotguides.com. The Complete Idiots Guide. Science Fair Projects: Which Foods Do Molds Love Best? By Nancy K. O’Leary and Susan Shelly.
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