1. Make a prediction which cup will stay cool longest?
2. Mix 500 ml of water with enough ice to lower the temperature to 10°C (about 200 ml of ice).
3. Make a hole in the cup lids so that you can put a thermometer in the cup and still read it without removing it from the water. (Why do you think this is important?)
4. Place one cup inside another cup so you have a double insulated cup (Cup 2). Repeat the process and construct a triple insulated cup (Cup 3). Cup one is just that--one cup!
5. Carefully measure and add 150 ml of the COLD water to each set-up. Put the lids on the cups and carefully slide the thermometers into the cold water. Record the temperature of the water right away.
6. Wait one minute, and then record the new temperature in each set of cups. Record the data in your laboratory notebook. It might help if you arranged the time and temperature in a table.
7. Continue recording data every five minutes for 20 minutes or until the water temperature is about equal to air temperature.
8. Calculate and record the change in temperature for each set-up.