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Trial 1 - Air in Bag

1. Humidity indicates how much water vapor (moisture) is in the air. Let's use a relative humidity sensor to compare the humidity of air in a room to the air exhaled in breath.

   Based on your experience with the mirror, do you feel that your breath has additional moisture? Discuss this question with your team and write down some of your ideas below. Be prepared to share your ideas with the class.
   
   

2. Refer to Technical Hints to connect the relative humidity sensor. A relative humidity sensor will measure the amount of moisture that is in the air.

   

3. Using one of the plastic bags, bag some air from the room and place the relative humidity sensor into the bag immediately. Make sure the slots on the relative humidity sensor are not blocked and are open to the air in the bag by standing the sensor on one end. Seal the bag and start the sensor. Stop recording after 2 minutes.
   
   

4. Save your graph as Trial I - Bagged Air.

   

5. Fill another bag with your breath and insert the relative humidity sensor into the bag immediately. Make sure the slots on the relative humidity sensor are not blocked and are open to the air in the bag by standing the sensor on one end. Seal the bag and start the sensor. Stop recording after 2 minutes.
   
   

   

6. Save your graph as Trial I - Bagged Breath.

7. Compare the graph of the bag filled with air to that of the bag filled with your breath. How did the bagged air compare to the bagged air from your lungs?