Students follow a series of investigations to collect data that helps them make inferences about humidity. In the first investigation student use a grow light to change the temperature. They should see humidity change as the temperature changes. In the second investigation, students keep the temperature constant (no light) and add additional water. They should see humidity change with additional water. 

CODAP will be used for data collection and data analysis. Students will transfer their data to tables in CODAP, they will then make graphs to determine trends for both investigations. 

Using the trends they determine from their data, they will develop rules for humidity. Through a class discussion they should come up with 3 major rules:
1. If the water vapor content stays the same and the temperature increases, the relative humidity decreases. 

2. If the temperature stays the same, and the water vapor increases, the relative humidity increases.

3. If the water vapor content stays the same and the temperature decreases, the relative humidity increases. (opposite of rule #1) 

They will then develop an investigation to apply these rules in spaces in the building. They will measure the temperature and humidity in the greenhouse, hallway, classroom, and outside. 

Develop a feedback loop - what variables account for high humidity in the greenhouse?

Should develop a loop with increasing temperature (which decreases humidity) and increasing water vapor (watering, transpiration, evaporation) to show the reasons for high humidity in greenhouse. 

Relate back to phenomena: 

Simple model of warming air, warming water (lake and land). Students make predictions of how it will impact regional humidity.