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Science Fair

Tennessee Virtual Academy
by

Kaitlyn Harris

on 11 January 2013

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Transcript of Science Fair

Cut nine 9 inch sheets of plastic wrap and aluminum foil.
Cut cheese into cubes.
Select 6 equal sized grapes.
Measure 6 tablespoons of congealed salad.
Let these foods get cold in the refrigerator
Take 2 of the cheese cubes and measure each of their temperatures.
Place one cheese cube in plastic wrap and one in aluminum foil.
Wrap each cube of cheese.
Repeat steps #6 through #8 with grapes and congealed salad.
Place items on kitchen counter.
Repeat steps #6 through #8 with cheese, grapes, and congealed salad.
Place them in the refrigerator.
Repeat steps #6 through #8 with cheese, grapes, and congealed salad.
Place them on the outdoor table.
After one hour at each location, measure the temperature again.
Compare results. Procedure Constants
sheet of aluminum foil
sheet of plastic wrap
Dependent Variables
grapes
cheese
congealed salad
Independent Variables (locations)
kitchen counter
refrigerator
table on outdoor deck Experimental Design 9 sheets aluminum foil
9 sheets plastic wrap
6 grapes
6 cubes cheddar cheese
6 tablespoons congealed salad
1 food thermometer
labels Materials If aluminum foil has better insulating qualities than plastic wrap, then I think aluminum foil will keep foods colder. Hypothesis Thermal conductivity is the ability of a material to transfer heat. It is measured in watts per degree kelvin. Thermal Conductivity Plastic wrap doesn’t conduct heat well. This makes it useful for keeping things warm or cold. Why Is Plastic Wrap A Good Insulator? Aluminum foil is a good insulator because it contains layers of reflective foil. These layers promote low emissivity of the shiny surfaces combined with low conductivity of air found in voids. The effectiveness of aluminum foil as an insulator is reduced if the shiny side becomes dull. Insulation Properties Aluminum foil is made of aluminum alloy, which contains between 92% and 99% aluminum. An advantage of aluminum foil is that it’s inexpensive, durable and grease-proof. It also resists chemical attacks and provides electrical and non-magnetic shielding. What Is Aluminum Foil? Plastic wrap is a thin, plastic film used to keep food fresh. A benefit of plastic wrap is that it forms a seal without using adhesive. The most purchased form, PVC, is less permeable to oxygen and flavors, but can seep chemicals into food. What Is Plastic Wrap? The purpose of my experiment is to find whether plastic wrap or aluminum foil keeps food colder.

Does plastic wrap or aluminum foil keep food colder?

The knowledge of my experiment will help out my community by being able to tell which items keep food colder. This will help out moms and others when in the kitchen. Purpose I chose this topic because it immediately jumped out at me.
As a food lover, I am interested to see which one keeps food colder. Kaitlyn Harris What Keeps Food Colder: Plastic Wrap or Aluminum Foil? In Degrees Fahrenheit Deck (54 degrees F) In Degrees Fahrenheit Deck (54 degrees F) In Degrees Fahrenheit Refrigerator (39 degrees F) In Degrees Fahrenheit Refrigerator (39 degrees F) In Degrees Fahrenheit Countertop (66 degrees F) In Degrees Fahrenheit Countertop (66 degrees F) Qualitative Research Data Analysis “What is Plastic Wrap?” wiseGEEK. conjecture corp. n.d. web. 19 Nov. 2012
“Aluminum Foil” enotes. enotes.com, Inc. 2002 web. 19 Nov. 2012.
“Insulation Properties.” engineersvault.blogspot. 9 Sep. 2009. web. 19 Nov. 2012.
“Why is plastic a good insulator.” answerbag. Demand Media, Inc. 19 Oct. 2008. web. 19 Nov. 2012.
“Thermal conductivity.” The American Heritage Science Dictionary. Houghton Mifflin Co. n.d. web. 19 Nov. 2012. Bibliography Major Result
Plastic wrap kept foods colder than aluminum foil.
 
Support the Hypothesis?
My hypothesis was that aluminum foil would keep foods colder. However, I found that, in these cases, plastic wrap kept food colder in two out of three cases.
 
Results Versus Research
My research showed that plastic wrap and aluminum foil have good insulating qualities. It also showed they both have low thermal conductivity, not allowing heat to strongly affect the wrapped items. My results showed this to be true, with plastic wrap ultimately keeping things colder.
 
Explanations For Results
While my hypothesis was that aluminum foil would keep foods colder, I actually found plastic wrap to be better because I believe I wrapped the foods with aluminum foil with the dull side against the food.
 
Errors
As discussed in my explanation, I believe the results turned out the way they did because I made the mistake of wrapping the foods with aluminum foil with the dull side toward the food. This caused the thermal conductivity of the aluminum foil to be adversely affected.
 
Possible Improvements
I would perform this experiment in exactly the same way using the aluminum foil correctly – with the shiny side down.
 
Future Studies?
Future studies could include experimenting with different foods, locations, timeframes, and materials for wrapping. Conclusion What Happened
When I checked the temperatures of each item in the countertop experiment, the plastic wrap kept each item an average of 1.3 degrees F colder than the aluminum foil.
 
When I checked the temperatures of each item in the refrigerator experiment, the aluminum foil kept each item an average of 1.2 degrees F colder.
 
When I checked the temperatures of each item in the deck experiment, the plastic wrap kept each item an average of 1.9 degrees F colder.
 
Explain
I found that plastic wrap kept the items colder than aluminum foil two out of three times.
 
Relate to Purpose
This relates to the purpose by letting chefs know which one keeps food colder for maximum amount of time to keep food fresh. Results Aluminum Foil - After 1 hour Aluminum Foil - Baseline Aluminum Foil - Baseline Aluminum Foil - After 1 hour Aluminum Foil - Baseline
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