Materials:

• Thermometer
• 1 cup size metal container  (non-insulated)
• Ice
• “Week 3 Lab Exercise: Determining the Dew Point Temperature” worksheet

Approximate time: 2 hours

Instructions:

• Fill the metal container with warm tap water (at least 50° F in the winter and 75° F in the summer).
• Place the thermometer in the water and begin to slowly add ice while continuously stirring the mixture.
• Record the temperature when the first sign of condensation begins to appear on the outside of the container. This reading should be within about 3° F of the dew point temperature.
• Compare your recorded temperature to the dew point temperature given on your local weather report. Repeat this process once or twice per day for 2 to 3 days to see if you are consistent in the outcome.