Science project

Insulation Experiment: Keep Your Body Warm


Which type of fabric insulates heat the best?


  • 7 glasses of the same size and shape
  • Water
  • Thermometer
  • Wool
  • Cotton
  • Denim
  • Lace
  • Fleece
  • Nylon
  • Kitchen timer
  • Notebook and pencil


  1. Before diving into the directions, think about the kinds of clothes you usually wear on a hot day: Are the fabrics heavy or light? What colors keep you cool? What colors make you feel warm? Jot down any notes in your notebook.
  2. Gather together a variety of fabrics. Wool, cotton, denim, lace, fleece, and nylon are all good choices.
  3. Look at the fabrics you'll be testing. Which fabric do you think will best keep the water temperature from dropping? List your guess, which is called a hypothesis, in your notebook.
  4. Place one glass on the table for each fabric that you plan to test. Add an extra glass to be used as your control for the experiment. This glass will get water of the same temperature as the other glasses, but won't be wrapped in a fabric.
  5. Fill each glass with water that reads 98.6 degrees Fahrenheit when a thermometer is inserted in it. Younger children who can't read a manual thermometer should be given a digital thermometer.
  6. Wrap each glass with a different fabric as if you were dressing one of your stuffed animals, leaving the last glass uncovered.
  7. Wait a total of 15 minutes. Kitchen timers are great for kids to use to count down the time.
  8. Using the thermometer, test the temperature in each glass.
  9. Record the results in your notebook. Make sure you can answer the following questions: Did any of the fabrics used around the glasses increase the water temperature? Did any of the fabrics used around the glasses decrease the temperature of the water? Did any of the glasses hold a 98.6 degree Fahrenheit temperature throughout the experiment?


Fabrics like wool and fleece are great insulators and will keep your body warm over an extended period of time. On the reverse side, fabrics like lace and cotton don't hold heat well, and won't keep your body warm very long.


To insulate something means to use a material that allows the least amount of heat to escape. Wool fibers are woven tightly together, and are much thicker than other materials, such as cotton. They don't allow much heat to escape, which means they are great insulators. Fabrics like cotton and lace are breathable fabrics, meaning they allow a great deal of heat to escape. They may be comfortable to wear, but they won't keep you from turning into an icicle on a cold day.

Now that you know which fabrics keep water warm the best, try another insulation experiment to see how different colors are able to absorb heat and keep your water warm. Stick with the same fabric throughout the experiment, like cotton, but use a different color on each glass. You'll want some dark colors and some light. Shine a lamp without it's shade in front of the glasses of water. Wait 15 minutes and then check the temperatures. Did you notice that the darker colored fabrics kept the glasses warmer? This is because dark colors actually absorb more heat than lighter colored fabrics.

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