What Is the Best Insulator: Air, Styrofoam, Foil or Cotton?

Each group needs:

• 4 3 oz. plastic cups
• 4 larger clear plastic cups
• 3 Styrofoam cups
• aluminum foil, 8½-in x 11-in piece
• 20 cotton balls
• teaspoon-sized spoon
• 4 rubber bands
• Data Chart (PDF), one per student, to be filled in during the experiment
• Results Chart (PDF), one per student, to be filled in after the experiment

To share with the entire class:

• pitcher of warm water
• plastic wrap
• baking pan
• large book or magazine
• freezer