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.
In this lesson you will be conducting a lab and collecting data to learn about humidity.
For this lab, you will use the following materials:
Set up your first investigation using the following procedure:
Open plastic box and put in humidity and temperature sensor. Note what units both variables are being measured in.
Close plastic box.
Take grow light and clip it on edge of table.
Position it so the light is approximately 10 cm above the box and the light is centered on the box (do not turn on the light).
Prepare a stopwatch or timer for you to count up.
Set up your data table below, so you will be able to record temperature and humidity data, you will take the measurement before turning on the light, and then every minute for 10 minutes.
When you are ready, turn on the grow light and begin timing.
In our investigation, we are examining 2 different variables, temperature and humidity. In setting up a table for the results, we want to organize it a specific way. In nearly all scientific tables, you will find the independent variable (IV) on the left and the dependent variable(s) (DV) on the right.
Determine which variable is being manipulated in this experiment (IV) and which one is responding (DV). List them below.
In this lesson we will be using a data platform called CODAP. This will allow us to manipulate and visualize the data from the experiment. In the CODAP window below, add your data to the table.
From the table we can create a graph. In this case we want to graph the relationship between the two variables. Click "graph" in order to begin a new graph.
On a graph, the independent variable should be represented on the x-axis. The dependent variable should be represented on the y-axis.
Drag the appropriate attribute name from the data table to the appropriate axis.
Look at the graph you made. Identify the trend you notice.
Sentence stem: As [independent variable] _______, [dependent variable] ___________.
(replace the IV and DV with the correct name and fill in the blanks)
Use scientific vocabulary. For example, I would say "increases" instead of goes up.
Set up your second investigation using the following procedure:
Note: If your box is still hot from the light in investigation 1, allow it to cool down until the temperature is stable for a few minutes.
Set up your data table below, so you will be able to record temperature and humidity data for each set of water sprays.
What data on your table is staying constant?
Which variable is likely impacting humidity?
From the table we can create a graph. In this case we want to graph the relationship between the variable we changed and humidity.
On a graph, the independent variable should be represented on the x-axis. The dependent variable should be represented on the y-axis.
Drag the appropriate attribute name to the appropriate axis.
Look at the graph you made. Identify the trend you notice.
Sentence stem: As [independent variable] _______, [dependent variable] ___________.
(replace the IV and DV with the correct name and fill in the blanks)
Use scientific vocabulary. For example I would say "increases" instead of goes up.
With your classmates, have a discussion to determine rules that apply to humidity. These should be based on the major trends you saw in the investigations.
List the major rules for relative humidity:
Next, you will develop an investigation to test these rules in spaces in the building. If not in the same school building, think about your own homes.
Where do you think temperature might be different in the building?
Which areas of the building might be different in humidity? Why?
Where in the building would have an increase in water vapor? Why?
Develop an investigation to test 4-5 places in the building for temperature and humidity. Think about the reason you would want to investigate this.
What are your independent and dependent variables for this investigation?
What is your testable question for this investigation?
Develop a procedure to test your testable question:
Humidity needs to be added as a variable on your model.
1. Add a new variable that represents humidity.
2. Show the variables that influence humidity by adding arrows to show the relationship.
3. Be sure to set the relationship and label the arrows.
Refer to Sage Modeler Guide for help drawing arrows, setting relationships, and labeling.
Add a screenshot of your model with humidity added.
Screenshot:
To take a screenshot:
Step 1: Hold down the Ctrl and Shift keys at once, then press the Switch window button.
Step 2: Chrome’s cursor will be temporarily replaced with a crosshair. Click and drag a square across the portion of the screen you want to save, then release the trackpad or mouse button.
The partial screenshot will be saved in the Downloads folder, the same as a full screenshot.
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