Give some ideas about science project based on biology to prevent global warming.
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Answer:
For this experiment, the independent variable is the concentration of carbon dioxide, either from air blown from our lungs or smoke from a car exhaust. The dependent variable is the temperature of the air in the tank. This is determined by measuring the temperature using an infrared thermometer. The constants (control variables) are the starting temperature of the air in the tanks, the amount of type of soil at the base of the tanks and the volume of the tanks.
The three water tanks are filled with a layer of black soil about 2 cm thick.A cover is placed over the first thank and masking tape is used to seal it in palce. It contains normal air.
The second water tank is filled with air from our lungs. Using the rubber hose, air is blown into the tank from your mouth, into a small opening in the cover of the tank. The tank is then sealed air tight with the cover and masking tape.
The third water tank is filled with air from the car exhaust. The open end of the plastic bag is wrapped around the exhaust of the car in such a way that the smoke from the exhaust will fill the bag. The plastic bag is fixed to the exhaust using masking tape. On the other end of the plastic bag, a small hole is made and the meter-long hose in inserted to a depth of about 5 cm. The hose is also fixed in place using the masking tape. The other end of the hose is inserted into a small opening in the tank cover, and the masking tape is used to seal the hose in its place. The car engine is started and left to run for 3 minutes with the help of the assistant and the smoke from the exhaust will be forced into the water tank. The tank is then sealed air tight with the cover and masking tape.Air from a person lungs a carbon dioxide concentration of about 4% whereas the smoke from the exhaust of a car will have about 12% carbon dioxide. The air around us has about 0.038% carbon dioxide.
The incandescence lamps are placed about 1 meter above each of the 3 water tanks. The lamp is left on until the temperature inside the tanks reaches 32 0C. The lamp is then switched off and the temperature inside the tank is recorded every 10 minutes for 1 hour. <Conclusion
The hypothesis that a higher concentration of carbon dioxide in the air will slow down the rate at which the temperature of the air falls, is proven to be true. The heat released by the soil in the tank is captured by the carbon dioxide molecules. Some of the energy is returned to the soil and some of it is released out of the tank. Since the tank with the car exhaust gas had the highest concentration of carbon dioxide molecules, it demonstrated the slowest rate of cooling down.
The increase in carbon dioxide levels in the atmosphere has led to an increase in global temperatures. It is causing significant changes to weather patterns, the melting of polar ice (glaciers), and the rising of sea levels, causing islands to disappear. Furthermore, the increase in ocean temperatures has led to to the extinction of certain species of marine life.
Also consider
The experiment can also be repeated using water to replace the soil in the tank.
Try to perform this experiment by using a hair dryer to obtain a higher starting temperature. Observe the difference in the rate of cooling.
Explanation:
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