Evaluation copy. The Greenhouse Effect. Computer OBJECTIVES
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1 The Greenhouse Effect Computer 24 Greenhouses allow gardeners to grow plants in cold weather. This is because the air inside the greenhouse stays warmer than the outside air. Short wavelength radiation from the sun passes through the glass, warming the interior of the greenhouse. The longer-wavelength radiation emitted does not pass through glass and is trapped in the greenhouse. This, along with the lack of mixing between the inside and outside air, keeps the greenhouse consistently warm. Incoming Solar Radiation Atmosphere Figure 1 On a larger scale, the greenhouse effect helps keep our planet warm. Figure 1 shows how short wavelength radiation from the sun passes through the atmosphere, warming the Earth. The longer wavelength energy is then trapped by certain gases called greenhouse gases. The greenhouse gases most responsible are water vapor, carbon dioxide, methane, and nitrous oxide. In this experiment, you will use two Temperature Probes to measure and compare the temperatures in model greenhouses under various conditions. In Part I, you will investigate the role of a plastic covering over the top of the model greenhouse. In Part II, you will investigate the effect of increased levels of two greenhouse gases water vapor, H 2 O, and carbon dioxide, CO 2. OBJECTIVES Reaches Surface In this experiment, you will Reflected Back to Space Re-radiated Back to Surface Absorbed by Greenhouse Gases Heat Radiated Back from Surface Evaluation copy Use Temperature Probes to measure temperatures in a model greenhouse and a control. Use the results to make conclusions about the greenhouse effect. Earth Science with Vernier 24-1
2 Computer 24 MATERIALS computer 2 rulers Vernier computer interface tape Logger Pro two 600 ml beakers 2 Temperature Probes soil lamp with 100 watt bulb plastic wrap PROCEDURE Part I The Effect of a Plastic Cover 1. Connect the Temperature Probes to the Vernier computer interface. 2. Tape Temperature Probe 1 and Temperature Probe 2 each to a ruler as shown in Figure 2. The probe tips should each be 3 cm from the ruler ends and the tape should not cover the probe tips. 3. Prepare the computer for data collection by opening the file 24 Greenhouse Effect from the Earth Science with Vernier folder. 4. Obtain two beakers and prepare them for data collection. Figure 2 a. Place a layer of soil 1 cm deep in each beaker. b. Place the Temperature Probes into the beakers as shown in Figure 2. c. Cover the top of Beaker 1 (the beaker containing Probe 1) tightly with plastic wrap. There should not be too much excess plastic wrap covering the sides of the beaker. Beaker 1 is your covered greenhouse and Beaker 2 is the control. d. Position a lamp bulb the same distance from both beakers. The bulb should be about 5 cm above the tabletop and the same distance from the two probe tips. 5. Click to begin data collection. Turn on the lamp. 6. Monitor the time in the meter. When 5 minutes have passed, turn off the lamp. Data will continue to be collected. 7. At the 10 minute mark, turn the lamp back on. Data collection will stop after 15 minutes. 8. When data collection stops, turn the lamp off. 9. Turn on the Examine feature by clicking on the Examine button,, on the toolbar. 10. Move the cursor to the 0 minute mark on the graph. Use the Examine box to determine the temperatures in Beaker 1 and Beaker 2 and record them in your data table. 11. Use the same method to determine the temperatures at the 5, 10, and 15 minute marks and record them in your data table. 12. Print copies of the graph as directed by your teacher Earth Science with Vernier
3 The Greenhouse Effect 13. Choose Store Latest Run from the Experiment menu. Part II The Effect of Greenhouse Gases 14. Cover Beaker 2 tightly with plastic wrap. The ruler and probe should still be in place. 15. Lift the edge of the plastic wrap on Beaker 1 to make an opening. 16. Take a deep breath and hold it for as long as is comfortable. Without touching your lips to the beaker, exhale into the opening filling Beaker 1 with your breath. 17. Reseal the plastic over the top of the beaker and reposition near the lamp. Important: Make sure the beakers are the same distance from the lamp and are being illuminated evenly as in Part I. 18. Click to begin data collection. Turn on the lamp. 19. Monitor the time in the meter. When 5 minutes have passed, turn off the lamp. Data will continue to be collected. 20. At the 10 minute mark, turn the lamp back on. Data collection will stop after 15 minutes. 21. When data collection stops, turn the lamp off. 22. Turn on the Examine feature by clicking on the Examine button,, on the toolbar. 23. Record the temperature values at the 0, 5, 10, and 15 minute marks in your data table. Important: Be sure that you are reading the Latest temperature values and not the Run 1 values from the Examine box. 24. Print copies of the graph as directed by your teacher. DATA Part I The Effect of a Plastic Cover Probe 1 Greenhouse Probe 2 Control Temperature Difference 0 Minute Temperature ( C) 5 Minute Temperature ( C) 10 Minute Temperature ( C) 15 Minute Temperature ( C) Earth Science with Vernier 24-3
4 Computer 24 Part II The Effect of Greenhouse Gases 0 Minute Temperature ( C) Probe 1 Greenhouse Gases Probe 2 Control Temperature Difference 5 Minute Temperature ( C) 10 Minute Temperature ( C) 15 Minute Temperature ( C) PROCESSING THE DATA Part I The Effect of a Plastic Cover 1. In the spaces provided in your data table, subtract to find the temperature differences. 2. During periods when the lamp was on, did the covered beaker warm faster or slower than the control? 3. Give a possible explanation for your answer to Question During periods when the lamp was off, did the covered beaker cool faster or slower than the control? 5. Give a possible explanation for your answer to Question Explain why a closed automobile heats up in the sun Earth Science with Vernier
5 The Greenhouse Effect Part II The Effect of Greenhouse Gases 7. In the spaces provided in your data table, subtract to find the temperature differences. 8. What two important greenhouse gases did the exhaled air contain? 9. During periods when the lamp was on, did the beaker with greenhouse gases warm faster or slower than the control? 10. Give a possible explanation for your answer to Question During periods when the lamp was off, did the covered beaker warm faster or slower than the control? 12. Give a possible explanation for your answer to Question In what way is the greenhouse effect good for the Earth? 14. In what ways might the greenhouse effect become a problem for the Earth? Earth Science with Vernier 24-5
6 Computer 24 EXTENSIONS 1. Repeat the experiment using the sun as the light source. 2. Run the experiment for two hours. How are the results different than your results for the 15 minute data-collection period? Explain the differences. 3. Repeat the experiment using plastic containers instead of glass ones. Discuss any differences that result Earth Science with Vernier
7 Vernier Lab Safety Instructions Disclaimer THIS IS AN EVALUATION COPY OF THE VERNIER STUDENT LAB. This copy does not include: Safety information Essential instructor background information Directions for preparing solutions Important tips for successfully doing these labs The complete Earth Science with Vernier lab manual includes 33 labs, 6 projects, and essential teacher information. The full lab book is available for purchase at: Vernier Software & Technology S.W. Millikan Way Beaverton, OR Toll Free (888) (503) FAX (503) info@vernier.com
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