1. Student Activities Centralized Training
Session 8a
K-12 Activity

2. (then click on “Get Involved” tab)
Available Kits
(then click on “Get Involved” tab)
This is where you add the demonstrations for group engagement

3. Available Kits Pressure Drop Endothermic and Exothermic Reactions
Uses drinking straws and water to demonstrate pressure drop increase due to straw length increase
Endothermic and Exothermic Reactions
Uses chemical hand warmers and ice packs to demonstrate heat transfer
Gamification
Uses computer games to teach math and science in a different, fun way
Sling Psychrometer
Uses thermometers to demonstrate difference between dry and wet bulb temperatures

4. General Format Introduce yourself and your other volunteers
Discuss a bit about what Engineering is about
Discuss the properties of air, specifically humidity
Hand out psychrometric charts and show/discuss the materials that will be used
Walk through the build process
Assist during the testing portion
Discuss what the students found
Take questions

5. Materials Kit Contents On-site Thermometers Packing Tape Rubber bands
Cloth
String
Psychrometric charts
On-site
Cardboard
Water
Scissors or hole punch

6. Instructions Divide into Groups Cut cardboard and puncture top side
Tape thermometers to cardboard
Wrap one thermometer with cloth and secure with rubber band
Tie string through hole at top

7. Instructions
6. Dip cloth in water 7. Carefully swing the sling psychrometer in a circle for at least two minutes 8. Record the temperatures of both thermometers 9. Consider taking measurements in other conditions 10. Plot the conditions on the psychrometric chart

8. Discussion
How did the Relative Humidity and Dew Point vary between inside and outside? What other areas of a school might be useful to check air properties? What can you say about the relative humidity of air if its dry bulb is the same as its wet bulb?